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How to write medical information in plain English


This guide gives you an idea of how the plain English approach can make your notices, letters and medical information clearer.

The guide will be useful if you work for:

  • the Health Service;
  • an NHS Trust; or
  • a company in the health sector.

Ten tips for clearer writing

These are recommendations, not rules: be flexible!

Think of your audience, not yourself.

Don't try to impress people by using your language to show off: keep it as straightforward as possible. Imagine you are speaking to someone, and write in that more relaxed way.

Use short sentences.

A good average sentence length ('ASL') is 15 to 20 words. Use shorter ones for 'punch'. Longer ones should not have more than three items of information; otherwise they get overloaded, and readers lose track.

Be careful with technical language.

Be prepared to explain any technical language and acronyms - will your audience know them? (See the A to Z.)

Use 'active' verbs mainly, not 'passive' ones.

Using the active is shorter and clearer; using the passive can be longer and sometimes confusing. Try to write 90% in the active. The other 10% - yes, you will find the passive more suitable.

  • 'A report will be sent to your doctor.' (passive)
  • 'We will send a report to your doctor.' (active)

Don't underline.

It is tempting to do this, but it achieves very little. It can be distracting, making the text harder to read. Proper spacing does the job. And :

Use lower case bold for emphasis, not block capitals.

Block capitals are hard to read, so don't put text in upper case. Use lower case bold. For headings, if need be, use large lower case bold.

Put complex information into bullet points.

Plan and draft your writing. If you have a lot of information to convey, make it easier for the reader by breaking it up into logical 'stepping stones'.

Use everyday words.

Big words, foreign phrases, bursts of Latin and so on usually confuse people. Consequently, it is a sine qua non of plain English not to write too polysyllabically! So, for plain English, use everyday words.

Write small numbers.

In text, write numbers one to nine as words; with 10 and upwards, put the figure. But be flexible. Probably with medicines it is clearer to write 'Take 2 tablets 4 times a day.'

Use the 'personal touch'.

Any organisation, however grand, can quickly become 'we'. Then the 'customer', 'client' or 'patient' simply becomes 'you'.

  • 'An information helpline is also operated by ABC Hospital Trust for the convenience of patients.'
  • becomes:
  • 'We also operate an information helpline for your convenience.'

Online communication/records

Communication between medical professionals and patients has changed, with all official correspondence now available online. This means you need to take more care than ever over how you communicate a medical issue. The results will form a permanent digital record, and will often have to stand alone as an explanation or interpretation of a patient’s health. There is no room for error or ambiguity – patients may read the information alone without any further information or re-explanation.


Here is an example of plain English in action.

This notice was put up by a hospital administrator. Below is the same notice, but put into plain English.

Dear Colleague


It is fully acknowledged that on site car parking is currently very limited and in this respect plans are currently being examined with a view to alleviating the problems.

One current area of concern is the area adjacent to Wards 10 and 11, and during a recent fire alarm call, which fortunately turned out to be an non emergency, the fire vehicles had extreme difficulty in manoeuvring in this area. In the event of a real fire you can rest assured that these vehicles would take whatever steps were necessary to reach their destination as quickly as possible, and therefore it is imperative that the perimeter road around the hospital site is left as clear as is possible. To help us with these problems both members of staff or visitors to the hospital who normally park in that area will now be able to park their vehicles in the Hospital Transport compound between the hours of 8.15 a.m. until 4.00 p.m. The gates of the compound will be left open and I ask that this space is utilised. May I also ask that it is important that no private vehicles remain in the compound after 4.00 p.m., due to the fact that transport Department vehicles will return to the site after that time and need to be in a secure area overnight.

The assistance of everybody in this matter is very much appreciated.

For the revised version, we have:

  • removed the heading (with its block capitals and underlining);
  • put the topic into the first sentence (now 19 words, not 29);
  • shortened the sentences in paragraph two;
  • used 'active' verbs; and
  • put the main instructions in bullet points.

Dear Colleague

We realise that car parking on site is very limited, and we are making plans to solve the problem.

One main difficulty is the area next to wards 10 and 11. During a recent fire alarm call (which turned out not to be an emergency) the fire engines had extreme difficulty getting through this area. In a real fire, they would take whatever action they needed to reach the emergency. So, you must keep the road around this area clear.

To help solve these problems, please:

  • park your vehicle in the Hospital transport compound, between 8.15am and 4pm; then
  • remove your vehicle by 4pm, as we need the compound overnight for Transport Department vehicles.

Thank you for your co-operation.


The revised version is easier to take in because it is more direct.

  • The original (ignoring the heading) was much longer: 230 words, with an average sentence length ('ASL') of about 33 words. The second is 119 words, with an ASL of 13 words.
  • Passive verbs have become active. For example:
    • 'it is fully acknowledged...' becomes 'we acknowledge (realise)...'
    • 'plans are currently being examined...' becomes 'we are making plans...'
  • Wordiness has been pruned. For example:
    • the repeating of 'currently' and 'current'
    • 'It is imperative that...' becomes 'you must...'
    • 'due to the fact that...' becomes 'as...'
  • 'To help with these problems both members of staff or visitors...' reads as though only two people work there. Remove 'both'

Overall, the second version gives you and your busy colleagues an easier ride. You don't have to fight your way through the words to get to the message.


On the next page is a 'standard letter' sent out by a hospital to patients telling them when they were due to come into hospital.

  • If you received this, would you be clear about what was happening? See if you can rewrite it using plain English, so that it answers these questions.
  • Is it one appointment or two?
  • Would two separate letters be better?
  • What is 'pre-assessment'?
  • Will having a cough or cold mean I can't come?
  • What if I fail to keep the pre-assessment appointment?



The following date for your operation has now been booked:-





Should there be any difficulties regarding the date of your surgery please telephone 76543 Monday-Friday, between 10.00 - 15.00 when someone will be available to take your call.

Your pre-assessment appointment is enclosed. The exact day of your admission will be confirmed at pre-assessment and is most likely to be the day prior to your operation.

We must, however, point out that at this stage we cannot guarantee bed availability. Will you therefore please telephone 76542 a couple of hours before your admission to confirm this arrangement. If you are unable to attend please telephone us as soon as possible to enable us to offer the bed to someone else.

If you develop a cough or cold prior to admission, please contact us as soon as possible.

Please report directly to the ward.

If you fail to arrive for this admission, you will not automatically be sent another admission date.

Yours sincerely

Can you do better than this?

You can get help from our website - download 'How to write letters in plainEnglish'.

Or come on the medical writing course to see how you and others would tackle it.

Over-the-counter (OTC) medicines

Information about OTC medicines needs to be easy to understand.

Here are some tips, followed by difficult examples from various medicines.

  • Use a reasonable type size on bottles and leaflets. Older people especially have trouble with tiny type. Some bottles, where space is tight, have labels that fold out into leaflets.
  • Use lower case bold for emphasis, not block capitals. And avoid italics, even though the EU guidelines recommend them!
  • Use ordinary words as far as possible. If complex medical words are needed, be prepared to explain them.
  • Use 'expiry dates' that are easy to read. Some are stamped so small that people can't find them, let alone make out the date.
  • Use plenty of white space, and don't cloud the message with watermarking (pictures faded in under the text).


The following is a random selection taken from labels on common painkillers, ear drops and so on. Many people would know some of the language through having spoken to a doctor. But many would find the labelling puzzling or alarming.

(The A-Z of medical terms covers most of the medical words used here.)

  • 'These tablets are for oral use...'
  • 'Five drops to be instilled...'
  • 'Could cause dyspepsia...'
  • 'Consult your doctor first if you are already taking medication for fluid retention using diuretics...'
  • 'Do not take these tablets if you are already taking another non-steroidal anti-inflammatory drug (NSAIDs)...'
  • 'More severe reactions may include blood in your vomit or black-looking stools, ulceration, vertigo, myocarditis, oedema, mental confusion, blood dyscrasias (disorders), increased bleeding time and gastro-intestinal irritation.'
  • 'This adult nasal spray is for local application in the nose to give symptomatic relief of nasal congestion (including in colds), perennial and allergic rhinitis (including hayfever) and sinusitis.' [30 words]

(A plainer version)

  • 'Use this spray on adults only. It will help relieve stuffed-up nose, inflamed sinuses and hay fever. Spray directly into the nose.'

And finally...

  • 'Do not take this product if your doctor has told you that you have phenylketonuria...'

A to Z of medical terms

Medical terms or phrases can often baffle your patients or customers. Try to watch out for this, and use ordinary language where possible. Be prepared to explain technical terms if you need to use them. What follows in this A to Z is a selection of words that people may find troublesome. It is not a 'correct' medical dictionary, and it is by no means complete, but it's a start!

A and E accident and emergency
AID artificial insemination by a donor
AIDS acquired immune deficiency syndrome
amnesia loss of memory
analgesic something that lessens pain
anastomosing joining together
aneurysm a swelling in an artery
antibiotic a chemical used to inhibit or stop the growth of bacteria
antipyretic substance that reduces temperature
arthroplasty repairing a joint (such as a hip replacement)
astigmatism uneven curvature of the eye that can lead to blurring or lack of focus
atrophy a wasting away (of tissues, such as muscles)
biopsy removing a small amount of tissue for examination in the laboratory
booked admissions allowing patients to arrange with the hospital a date to come in for an operation
bronchoscopy examining the bronchial tubes with a small flexible camera tube (an endoscope)
cardiology study and treatment of the heart
cardiothoracic to do with the heart and lungs
chemotherapy treatment (usually of cancer) by drugs
chronic a long-lasting disease that changes slowly
cirrhosis progressive disease of the liver (often associated with alcohol abuse)
coeliac to do with the abdomen (usually the small intestine)
colonoscopy examining the colon (bowel) with an endoscope
colorectal to do with the colon and rectum
colposcopy examining the vagina or cervix with an endoscope
CPM continuous passive motion: a machine with a motor to help flex limbs
CT scan computerised tomography is a type of three-dimensional X-ray giving far more information than a normal X-ray
cystoscopy examining the bladder with an endoscope
D and C dilation and curettage: widening of the cervix to take a sample scraping of the lining of the womb
dialysis filtering the blood, cleansing it
discharge 'going home' is more reassuring; keep 'discharge' for running sores!
diuretic a drug that helps to remove excess water from the body
dysfunction not working properly
dyspepsia indigestion; upset stomach
ECT electroconvulsive (electroshock) treatment
ectopic outside (ectopic pregnancy; a baby developing outside the womb)
electrocardiogram a graph showing the electrical activity of the heart, including the heartbeat
electrocardiograph a machine used to produce an electrocardiogram
embolism blocking of an artery (by a blood clot or air bubble)
encephalitis inflammation of the brain
endometriosis the presence of tissue similar to the lining of the womb at other sites in the pelvis
endoscope various types of flexible tube with a fibre-optic camera for seeing inside organs
enuresis bed-wetting
epidural usually refers to an injection in the lower spine, often given during childbirth to reduce pain
faeces solid waste from the bowel; motions; stools
femur thigh bone
fracture a broken bone:
  • 'compound'- with a skin wound
  • 'closed' - without a skin wound
  • 'comminuted'- in many pieces
gastroenterology study and treatment of the stomach and intestines. The disease is 'gastroenteritis'
GU genito-urinary (as in 'GU' department); urogenital; to do with reproduction and urination; dealing also with sexually transmitted diseases
gynaecology study and treatment of the female genital tract, including reproduction
haematology study of the blood
haemophilia severe bleeding, without clotting; so, 'haemophiliac': a person with this problem
haemorrhoids piles
hepatic to do with the liver; so, hepatitis: liver disease HIV human immunodeficiency virus; can lead to AIDS
ICU intensive care unit
image intensifier instant x-ray images on a TV monitor
jaundice a yellowing of the skin or the whites of the eyes due to liver disease
jugular of the neck or throat; so, jugular vein
keratic horny, hardening of the skin
keratitis inflammation of the cornea of the eye
kidney organ that filters blood and excretes urine
kymograph instrument that measures blood pressure
labial relating to lips
labyrinthitis inflammation of the inner ear, causing dizziness
lachrymal duct the channel near the eye that produces tears
lactation production of milk to breast-feed babies
laparoscopy examining the abdomen with an endoscope
laryngitis inflammation of the vocal chords (larynx)
laxative treatment for constipation
lithotripsy breaking up kidney or gall stones using ultrasound
mammography examining the breasts by x-ray
maxillofacial to do with the face or jaw; (removing a wisdom tooth)
metastasis the spreading of tumour cells round the body
miscible able to be mixed with another liquid
MMR measles, mumps, rubella: the three-in-one vaccination for children
motor neurone disease a progressive wasting of the nerves that control your muscles
myocardial infarction a heart attack; seizure of heart muscle
nasal to do with the nose
nauseous feeling like you are going to be sick
necrotic used to describe dead cells or tissue
neoplasm new and abnormal growth; tumour
neurology study of the nervous system
neurophysiology study of the changes associated with the activity of the nervous system
obstetrics care and control of pregnancy and childbirth
oedema swelling caused by fluid
oncology study and treatment of tumours
ophthalmic to do with the eye; ophthalmology - its treatment
orthodontics dentistry specialising in correcting teeth problems
orthopaedics treatment of bones and muscles (originally, in children)
osteopathy treatment by manipulation and massage of muscles and bones
osteoporosis brittle bones; weakening of the bones
otolaryngology treatment of diseases of the ear and throat
paediatrics study and treatment of children and their diseases
palliative care lessening pain without curing the symptoms
paraplegia paralysis of the legs
patella the kneecap
pathology study of the causes of disease; the testing (biopsy) of tissue to check for disease
pertussis whooping cough
phenylketonuria inherited difficulty in processing an amino acid; can lead to learning difficulties (mental handicap)
physiotherapy use of physical methods to promote healing such as massage, manipulation and exercise
podiatry a branch of chiropody
post-op after the operation
post operative after the operation
pre-assessment a hospital appointment before the operation date to check details
pre-med drug given before an anaesthetic to calm the nerves before an operation
prophylactic something taken to prevent disease
quadriplegia paralysis of all four limbs
quarantine isolation of someone with an infectious or contagious disease (originally for 40 days)
quinsy abscess on or near the tonsils
radiography taking x-rays; the x-ray department
radiotherapy using radiation for treatment (especially of cancer)
renal to do with the kidneys
rhinitis inflammation in the nose
sigmoidoscopy examining the inside of the colon (bowel)
sinusitis inflammation of the sinuses ('tubes'), usually around the nose
sutures stitches
syndrome the set of symptoms associated with a particular disease
thrombolysis dissolving a blood clot
tomogram the image produced by a computerised tomography (CT) scan, a very detailed three-dimensional X-ray
trachea the windpipe
trauma a wound or injury (usually); emotional shock
triage sorting out patients according to how urgently they need treatment ('A and E')
urethra 'tube' from the bladder, carrying urine
urology study and treatment of the urine system
venereal disease 'VD'; sexually transmitted disease
ventricle a cavity or chamber in the heart or brain
xanthoderma yellowing of the skin
xeroderma dry skin ('ichthyosis')
yellow fever mosquito-borne hepatitis, causing jaundice, maybe death


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