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Symptoms A–Z

Explore symptoms and related conditions.

Health information from the NHS website Content supplied by the NHS website Refreshed 19 August 2026. NHS guidance and services shown are written for people in England. View the original A–Z ↗

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Back pain

Find out how to relieve back pain, what can cause it and when to get medical advice.

Bad breath

Find out what causes bad breath (halitosis), how to treat and prevent it, and when to get medical advice.

Bedwetting in children

Find out what you can do about bedwetting, what could be causing it and when to get medical help.

Bleeding from the bottom (rectal bleeding)

Bleeding from the bottom (rectal bleeding) is often seen as small amounts of bright-red blood on toilet paper or pink water in the toilet. Find out when to...

Bloating

Find out about common causes of bloating, what you can do about it and when to get medical help.

Blood in semen

Find out about possible causes of blood in semen and when to get medical help.

Blood in urine

Find out about blood in urine (pee). It's not usually anything serious, but sometimes it can be, so you must get it checked out by a GP.

Blue or grey skin or lips (cyanosis)

Find out about blue or grey skin or lips (cyanosis), including what it looks like, what causes it and when to get it checked.

Blushing

Find out how to stop yourself blushing and read about the possible causes and treatments.

Body odour (BO)

NHS information and advice about how to treat body odour, including when to see a GP if the problem persists.

Bowel incontinence

Find out about bowel incontinence, including the symptoms, what causes it and the treatments available.

Breast lumps

Find out about breast lumps. They can have a lot of different causes and most are harmless. But always see a GP if you have a lump in your breast or any...

Breast pain

Find out about breast pain and what can cause it. It's usually linked to periods but can also be caused by injury, infection and taking certain medicines.

Bulging eyes (exophthalmos)

Find out what can cause the eye to bulge and what treatments may help.

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Hair loss

Hair loss can have many causes. Alopecia is the general medical term for hair loss. Find out when to see a GP and what treatments are available.

Hallucinations and hearing voices

Find out about hallucinations and hearing voices, including signs, causes and treatments.

Hand pain

Choose which area of your hand hurts most to find out about treatments, when to get medical help and possible causes.

Headaches

Find out about headaches, including what you can do to help ease them, when to get medical advice and what the most common causes are.

Hearing loss

Find out about the common signs and causes of hearing loss, when to get medical help and how hearing loss is treated.

Heart palpitations

Find out what heart palpitations are, what they feel like, common causes and when to get medical help.

Heartburn and acid reflux

Find out more about heartburn, a burning feeling in the chest caused by stomach acid travelling up towards the throat (acid reflux). If it keeps happening,...

Heavy periods

Find out about heavy periods (called menorrhagia) and how to treat them if they are affecting your daily life.

Heel pain

Find out about what causes heel pain and what you can do to ease the pain yourself.

Hiccups

Find out about things you can do yourself to stop or prevent hiccups.

High temperature (fever) in adults

Find out about high temperature (fever) in adults including what causes it, how to tell if you have a high temperature and how to treat it.

High temperature (fever) in children

Find out how to check if your child has a high temperature (fever), what you can do to bring their temperature down, and when to get medical help.

Hip pain in adults

Find out about common causes of hip pain in adults, how you can help ease hip pain and when you should get medical help.

Hip pain in children (irritable hip)

Find out about hip pain in children, including what causes it, when to get medical help and how it can be treated.

Hives

Find out about hives (also called urticaria), which is a raised, itchy rash that's usually caused by a reaction to things like food, pollen, insect bites or...

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Pain in the back of the hand

Find out what to do about pain in the back of your hand, when to get help and the common causes.

Pain in the ball of the foot

Find out about pain in the ball of your foot, which is known as metatarsalgia, common causes and how you might treat it.

Pain in the bottom of the foot

Find out about common causes of pain in the bottom of your foot (ball, arch or sole) and how you might treat it.

Pain in the palm of the hand

Find out what to do about pain in the palm of your hand, when to get help and the common causes.

Pain in the top of the foot

Find out about common causes of pain in the top of your foot and how you might treat it.

Paralysis

Find out about paralysis, including symptoms, causes and treatments.

Pelvic pain

Find out about common causes of pelvic pain in adults, how you can ease pelvic pain and when you should get medical help.

Penis lumps and spots

Find out about lumps and spots on the penis, including what can cause them and when to get medical advice.

Period pain

Find out about period pain, including symptoms, causes, when to see a GP, diagnosing underlying conditions and treatment.

Pins and needles

Read about pins and needles (paraesthesia), a pricking, burning, tingling or numbing sensation that's usually felt in the arms, legs, hands or feet.

Postmenopausal bleeding

Find out about postmenopausal bleeding, what could be causing it, when to get medical help and what treatments are available.

Priapism (painful erections)

Read about priapism, a persistent, often painful erection. If it lasts for more than 3 to 4 hours, go to A&E to prevent permanent damage.

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Shortness of breath

NHS information about shortness of breath, or breathlessness, including when to get medical help and what the cause might be.

Shoulder pain

Find out how you can relieve shoulder pain, what can cause it and when to get medical advice.

Smelly feet

Smelly feet (bromodosis) are common and usually caused by a build-up of sweat and bacteria. Find out what you can do to treat and prevent them yourself.

Smelly urine

Find out about smelly urine, which on its own is not usually a cause for concern. Find out what can cause smelly pee and how to keep it clear and smelling mild.

Snoring

Find out what you can do if you snore, why it happens, when to get medical help and what treatments can help.

Soiling (child pooing their pants)

Read about soiling, which is when a child regularly poos their pants. Find out why it happens and what to do about it.

Sore or dry lips

Find out how to look after your lips when they're exposed to the sun, wind and cold.

Sore or white tongue

Find out how to treat a sore or white tongue and read about the possible causes such as geographic tongue, oral thrush and mouth ulcers.

Sore throat

Find out what can cause a sore throat, how you can soothe it and when to get medical advice.

Stomach ache

Read about a stomach ache and abdominal pains, including stomach cramps or an ache in the tummy (abdomen).

Stress

This topic is listed in the NHS A to Z, but reusable structured article text is not currently available.

Stretch marks

Find out about stretch marks, including where, when and how you get them, what causes them, and how they can be treated and prevented.

Sudden confusion (delirium)

NHS information about sudden confusion (delirium), including how to tell if someone is confused and when to get medical help.

Swollen ankles, feet and legs (oedema)

Find out about swelling in the ankles, feet and legs (oedema), including what it looks like, common causes and what to do about it.

Swollen arms and hands (oedema)

Find out about the causes of swollen arms and hands, what to do about it and when to get help.

Swollen glands

Read about swollen lymph glands, which are usually a sign of infection. Find out what the symptoms are, how to ease them and when to get medical help.

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