Hotel Pools And Hot Tubs May Bring Health Risks

Overview

Hotel pools and hot tubs are treated with disinfectants like chlorine to kill germs, but that protection is not perfect. When germs, pee, sweat, or body oils get into the water, they can cause problems for people who swim or soak. Health experts call the illnesses you can catch this way 'recreational water illnesses' — a catch-all name for infections and irritations linked to water in pools, hot tubs, spas, and splash areas. Problems can range from a short bout of diarrhoea or an itchy rash to ear infections, coughs, and, rarely, more serious lung infections. Hot tubs carry extra risk because the warm water makes disinfectant break down faster and because the jets create a fine mist that is easy to breathe in.

Illness linked to pools and hot tubs is more common than most people expect, and it is often never traced back to the water. Many people assume they caught a 'stomach bug' or a 'summer cold' when the source was a hotel pool or spa. Outbreaks are reported every year around the world, most often involving diarrhoea-causing germs in pools and lung infections linked to hot tubs and spa displays.

Anyone can be affected, but some people are more vulnerable: young children, who often swallow water and may be in nappies; pregnant women, who can overheat in hot tubs; older adults, who are more at risk of dehydration and serious lung infections; people with weakened immune systems; people with asthma or sensitive skin; and anyone with an open cut or wound. People who drink alcohol while using a pool or hot tub are also at higher risk, mainly because of slips, falls, and drowning.

Symptoms

Common symptoms

• Watery diarrhoea, stomach cramps, feeling sick, or vomiting, usually starting a few days after swimming
• An itchy rash of red bumps, especially under swimwear or where the water pressed against skin
• Ear pain, itching, or discharge — sometimes called 'swimmer's ear'
• Cough, wheeze, chest tightness, or breathlessness after being in a hot tub or spa
• Stinging, red, or itchy eyes, and a sore or dry throat
• A blocked or runny nose and general cold-like symptoms
• Fever or feeling generally unwell

Symptoms in children

• More frequent diarrhoea and vomiting, with a higher risk of dehydration
• Ear infections, which are common in children who spend a lot of time in water
• Swallowing pool water is the main way children pick up stomach bugs, so symptoms may appear without an obvious cause
• Irritability, fewer wet nappies, dry mouth, or unusual sleepiness can be signs of dehydration and need prompt attention
• Cough or noisy breathing after hot tub use should always be checked by a doctor

Symptoms in older adults

• Dehydration and overheating from long soaks in hot water, which can cause dizziness and falls
• Feeling faint or confused after sitting in a hot tub
• More serious chest infections, including legionnaires' disease (a lung infection caused by breathing in contaminated water mist), which can start with flu-like symptoms
• Skin that is thinner and more easily irritated or infected
• Symptoms may be less obvious at first, so a low-grade fever or new cough is worth mentioning to a doctor

Causes

Main causes

• Swallowing water that contains germs such as cryptosporidium, giardia, norovirus, E. coli, or shigella — the main cause of stomach illness
• Breathing in fine mist from hot tubs or spa jets that carries germs like legionella, which can lead to a type of pneumonia
• Skin contact with water containing germs such as pseudomonas, which causes an itchy bumpy rash often nicknamed 'hot tub rash'
• Germs getting into the ear canal, causing infection, especially in people who swim often
• Chemical irritation: when chlorine mixes with sweat, pee, and body oils it forms 'chloramines', which irritate eyes, skin, and airways and can trigger asthma symptoms
• Germs surviving because disinfectant levels were too low, the water was too warm, or the pool or hot tub was poorly maintained

Risk factors

• Using hot tubs and spas, where warm water and bubbling mist increase risk
• Swallowing pool water, which is much more likely for young children
• Swimming while you have diarrhoea, or sharing water with someone who does
• Crowded pools, particularly during busy holiday periods
• Children who are not yet toilet trained or who wear swim nappies
• Having a weakened immune system, including during pregnancy or after illness
• Open cuts, grazes, or recent tattoos and piercings
• Drinking alcohol before or during swimming or hot tub use
• Long soaks in hot water, which can lead to overheating and dehydration

When to see a doctor

See a doctor urgently if:

• Diarrhoea with blood, severe pain, or a high fever
• Signs of dehydration: very little urine, dry mouth, dizziness on standing, or unusual drowsiness
• Any breathing difficulty, chest pain, or a cough with fever after hot tub use
• A skin rash that is spreading quickly, very painful, or feels hot
• Severe ear pain or discharge from the ear
• You are pregnant and have a high fever or feel unwell after using a hot tub

Book a routine appointment if:

• Diarrhoea or stomach upset that lasts more than a few days
• An itchy rash that does not settle within a week
• Mild ear discomfort or itching that keeps coming back
• A cough or cold-like symptoms that linger after a hotel stay
• You want advice because you are unsure whether your symptoms are linked to swimming

Diagnosis

A doctor will usually start by asking about your symptoms and whether you have recently used a pool, hot tub, spa, or water park. That single question — 'Have you been in the water lately?' — is often the key clue. Depending on your symptoms, they may examine your tummy, ears, skin, or chest, and may ask for a sample to test. Many mild cases get better before a specific cause is ever found, and that is normal.

Tests that may be done

• A stool (poo) sample to look for germs that cause diarrhoea
• A throat or phlegm sample, or a urine test, if there are signs of a chest or lung infection
• A skin swab from an itchy or bumpy rash
• Blood tests if you are very unwell or your immune system is weak
• An ear examination with a small instrument called an otoscope
• A chest X-ray if breathing problems or pneumonia are suspected

What to expect at your appointment

Most appointments are short and straightforward. Bring a note of where and when you swam or used a hot tub, how long ago symptoms started, and any medicines you take. If a test is needed, results can take a few days, and you may be asked to start simple supportive care in the meantime — mainly rest and fluids. If your symptoms point to a lung infection, your doctor will decide whether any specific treatment is needed and will explain the next steps.

Treatment

Treatment depends on what is causing your symptoms. Most water-linked illnesses are mild and need no specific medicine — the body clears them with rest and good hydration. When a particular germ or infection is confirmed, a doctor can discuss whether a prescription treatment would help for your situation.

Self-care at home

• Drink plenty of fluids — water and oral rehydration drinks are best if you have diarrhoea or vomiting
• Rest and avoid swimming or hot tubs until at least two weeks after diarrhoea has fully stopped, to avoid passing germs on
• Wash your hands carefully with soap and water after using the toilet and before preparing food
• For an itchy rash, keep skin clean and dry, avoid tight clothing, and use gentle, fragrance-free moisturiser
• For ear discomfort, keep the ear dry and avoid picking or inserting anything into it
• For mild eye or throat irritation, rinse with clean water and stay away from heavily chlorinated water for a few days
• Do not share towels or swimwear while you have a rash or stomach upset
• Get plenty of rest and give your body time — most people improve within a week

Medical treatments

If your doctor confirms a bacterial or parasitic infection, they may discuss a prescription medicine that targets that germ. Some germs, including the common crypto parasite, do not respond to antibiotics, so treatment focuses on replacing fluids and easing symptoms. For a skin infection, an antibiotic cream or tablets may be suggested. For ear infections, a doctor may recommend ear drops or, in some cases, antibiotics. Lung infections such as legionnaires' disease need medical assessment and sometimes hospital care. Your doctor or pharmacist can explain what is suitable for you, taking into account your age, pregnancy, allergies, and other health conditions.

When is surgery considered?

Surgery is very rarely needed. It may only be considered for unusual complications, such as a severe ear or skin infection that does not respond to treatment, and your specialist would discuss this with you.

Living with this condition

While you recover, keep things simple: rest, drink regularly, and stay away from pools, hot tubs, lakes, and the sea until you are fully well. If you are on holiday, it is fine to enjoy the surroundings — just ask your hotel about the pool's maintenance and chlorine testing, and choose other activities until symptoms pass. Wash your hands often, especially before eating and after the toilet, and keep your own towel separate at home.

Lifestyle tips

• Shower before and after using any pool or hot tub — it protects you and everyone else
• Never swallow pool or hot tub water, and remind children not to
• Take regular toilet breaks for young children and check swim nappies often
• Limit hot tub sessions to about 15 minutes at a time, and get out if you feel dizzy or too hot
• Avoid alcohol when swimming or using a hot tub
• Cover any cuts or grazes with a waterproof dressing, or stay out of the water
• Avoid hot tubs during pregnancy, or check with your midwife first — overheating can be harmful
• Choose pools where you can see the bottom clearly and where the water does not smell strongly of chemicals

Diet and exercise

There is no special diet for these illnesses, but if you have diarrhoea or vomiting, focus on replacing fluids and salts — small sips of water or oral rehydration drinks, taken often. Eat light, plain food as your appetite returns. Once you feel well again, gentle exercise such as walking is a good way back into activity. Wait until you have fully recovered before swimming laps or returning to the hot tub, and build up gradually.

Mental health and emotional wellbeing

A holiday illness can be genuinely disappointing, and it is normal to feel frustrated or anxious, especially if you have lost time with family or missed part of a trip. Symptoms like an itchy rash can also affect confidence and sleep. Be kind to yourself, talk to someone you trust, and remember that these illnesses are usually short-lived. If you feel persistently low or worried, or if health anxiety is affecting your daily life, speak to your doctor — support is available and effective.

Prevention

Yes, largely. You cannot make a pool germ-free, but a few simple habits greatly lower your risk. Choose places that look well run, shower before and after, keep water out of your mouth, and stay out of the water if you have diarrhoea. Hotels and pool operators also play a big part by testing and treating water properly, and many countries have public health guidance they must follow.

Screening programmes

There is no routine screening for water-linked illness. Instead, look after the water you use: many people carry cheap chlorine and pH test strips when travelling, which give a rough idea of whether a hotel pool or hot tub is being maintained. Pool and hot tub operators should test the water regularly — if you are concerned about cleanliness, it is reasonable to ask hotel staff about their testing routine.

Complications

If left untreated

• Dehydration, especially in young children and older adults
• Longer-lasting or more severe diarrhoea, and weight loss
• Ear infections that spread or keep returning
• Skin infections that can become painful and need medical treatment
• Chest infections, including legionnaires' disease, which can be serious and needs prompt care
• Reactive arthritis (joint pain and swelling that can follow a gut infection), which usually settles over weeks to months
• Rarely, a serious kidney or blood complication from certain gut germs

Long-term outlook

For most people, the outlook is very good. Stomach bugs and hot tub rashes usually clear within days to a couple of weeks, and ear and skin infections respond well to treatment. Serious lung infections are uncommon and can be treated, particularly when caught early — so do seek help if a cough, fever, or breathlessness appears after hot tub use. With a bit of care, pools and hot tubs remain an enjoyable part of a holiday for most families.

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