Find out about earache and ear pain, a common condition, particularly in young children. It's not usually a sign of anything serious, but it can be painful.
Read about the signs of early or delayed puberty, what can cause it and how it can be treated.
Find out more about what problems a build-up of earwax can cause, why it happens, and what can be done about it.
Find out more about Ebola virus disease, a serious infection usually found in certain parts of Africa.
Read about echocardiograms, including why they're done, what happens during the test, and what the risks are.
Read about ectropion (a drooping lower eyelid). Find out what the symptoms are, what causes it, when to get medical advice and how it's treated.
Edwards' syndrome, also known as trisomy 18, is a serious genetic condition caused by an additional copy of chromosome 18 in some or all of the cells in the body.
Ehlers-Danlos syndromes (EDS) are a group of rare inherited conditions that affect connective tissue. Find out about the symptoms, causes and treatments.
Ejaculation problems such as premature, delayed and retrograde ejaculation are a common cause of sexual problems in men.
Find out what you can do to treat a painful arm or elbow yourself, and when to get medical help.
Find out more about ECGs (electrocardiograms), including why they're done, the different types, and what happens.
Find out about an electroencephalogram (EEG), which records brain activity, and when this type of test may be used.
Find out why and when an electrolyte test may be needed. Also, read about the possible treatments that may be recommended if you have an electrolyte imbalance.
Read more about emollients, which are moisturising treatments applied directly to the skin. They're often used to treat skin conditions like eczema.
Empyema is the medical term for pockets of pus that have collected inside a body cavity. They can form if a bacterial infection is left untreated, or if it fails to fully respond to treatment. The term empyema is most commonly used to refer to pus-filled pockets that develop in the pleural space. This is the slim space between the outside of the lungs and the inside of the chest cavity.
Find out about the different types of endoscopy. The type of endoscopy you have will depend on your symptoms.
Find out about enhanced recovery, an evidence-based approach that helps people to recover more quickly after having major surgery.
Read more about epididymitis, which is when the epididymis (a coiled tube at the back of each testicle that stores and carries sperm) becomes swollen and painful.
Read about epiglottitis, which is inflammation and swelling of the epiglottis, a flap of tissue that sits beneath the tongue at the back of the throat.
NHS information about erythema multiforme, including symptoms, when to get help and treatment.
NHS information about erythema nodosum. Find out what it is, what the symptoms are, what causes it, when to get medical help and how it’s treated.
NHS information about erythromelalgia, a rare condition that causes episodes of burning pain and redness in the hands and feet, and sometimes the arms, legs, ears and face.
Read about euthanasia (deliberately ending a person's life to relieve suffering) and assisted suicide (deliberately assisting a person to kill themselves). Both are illegal in England.
Read about excessive daytime sleepiness (hypersomnia), a condition that causes you to feel very sleepy during the day, even if you had a good night's sleep.
Read about eye cancer, including the symptoms, causes, treatments, and outlook.
Find out what to do if you have an eye injury, including when to get medical help.
Find out what to do if you have a lump on your eyelid, or an eyelid that's swollen, sticky, itchy or painful.
Read about the routine eye checks that newborn babies have and eye tests for children. Eye checks are important because they allow any problems to be identified early on in a child's development.
Find out about excessive thirst, including what might be causing it, when to see a GP and the difference between dry mouth and excessive thirst.
An ectopic pregnancy is when a fertilised egg implants itself outside of the womb, usually in one of the fallopian tubes.
Find out about encephalitis, a rare but serious condition that causes inflammation of the brain.
Endocarditis is a rare and potentially fatal type of heart infection. It's specifically an infection of the inner lining of the heart (the endocardium).
Find out about endometriosis, a common condition where tissue similar to the lining of the womb grows in other places, such as the ovaries and fallopian tubes.
Epidermolysis bullosa (EB) is a general term used to describe a group of rare, inherited skin disorders that cause the skin to become very fragile.
An epidural is an injection in your back to stop you feeling pain in part of your body, commonly given for pain relief in childbirth and in some types of surgery.
Find out about epilepsy, where sudden bursts of electrical activity in the brain cause seizures or fits.
Find out what erectile dysfunction is, what the common causes are and how it can be treated.
Find out about possible causes and treatments for excessive sweating (hyperhidrosis).
Find out about excessive hair growth (hirsutism), including when to see a GP and information about treatments and causes.
Read about the symptoms and treatment of a blood disorder called erythrocytosis (sometimes called polycythaemia), which means having a high concentration of red blood cells in your blood.
Find out about early menopause, when a woman's periods stop before the age of 45, and the treatment available
Find out about ear infections, which are very common, particularly in children. See a GP if the infection does not settle in a couple of days.
Find out more about the emergency contraceptive pill, including how to get it and when to take it.