What’s actually happening in your gut when you get indigestion?

Indigestion is often described medically as functional dyspepsia — meaning there’s no single visible cause, but the way your stomach empties and moves food becomes disrupted. This can show up as postprandial distress (discomfort after eating), epigastric pain in the upper stomach area, bloating, early satiety (feeling full too quickly), or belching. Some people also regurgitate small amounts of food or acid, or notice their stomach distend and delay emptying — in rarer cases this can be caused by gastroparesis, a more lasting motility problem — while food that isn’t broken down properly can ferment in the gut.

How is indigestion linked to acid reflux and GORD?

Indigestion and heartburn are closely linked to acid reflux, and reflux-related symptoms can sometimes point to GORD (gastro-oesophageal reflux disease). This acid-induced irritation can range from acute, one-off episodes to more chronic or recurrent patterns. Some people have non-erosive reflux disease, where the lining looks normal despite symptoms, while others develop erosive or ulcerating changes — peptic damage that a clinician can identify. When symptoms don’t respond to standard treatment, this is known as refractory indigestion and may need further investigation.

What if indigestion doesn’t improve, or keeps coming back?

If tests show a Helicobacter pylori infection, your clinician may prescribe antibiotics to eradicate H. pylori, since this can otherwise exacerbate symptoms long-term. Sometimes no clear cause is found even after doctors diagnose and investigate further — this is described as idiopathic or functional indigestion. In these cases, treatment tends to be symptom-related, focusing on managing what you’re experiencing rather than a single underlying cause.

Viral Infections: Types, Recovery & When to See a GP

A viral infection is an illness caused by a virus. While most common viruses, like colds and stomach bugs, are self-limiting and can be managed at home with rest and hydration, recovery times vary. Antibiotics do not treat viral infections. You should speak to a GP if your symptoms worsen, persist for several weeks, or cause concern.

It is frustrating and exhausting to wake up with the aches, fatigue, and sniffles that signal a virus is going around. While most viral infections settle on their own, understanding what is happening in your body helps you recover faster. Knowing how to manage your symptoms effectively, and critically, recognising the warning signs that mean you need medical help, is essential for a safe recovery.

What is a viral infection?

A viral infection is an illness caused by a virus, a tiny infectious agent that replicates inside the living cells of other organisms. Viruses cannot survive on their own and need a host to multiply. You catch them by breathing in infectious droplets or touching contaminated surfaces, according to the NHS.

Viral vs bacterial infections: what's the difference?

This is a common point of confusion for patients. The fundamental biological difference is that bacteria are living, single-celled organisms, while viruses are not living cells. Because of this difference, treatments vary significantly. Crucially, viruses are not affected by antibiotics. Taking antibiotics for a viral infection will not make you better and can cause unwanted side effects.

Feature	Viral infection	Bacterial infection
Size and nature	Tiny infectious agents, not living cells	Larger, single-celled living organisms
Reproduction	Needs a host cell to multiply	Can multiply independently
Treatment	Symptom management, antivirals (for certain types of infection)	May respond to antibiotics if clinically indicated
Common illnesses	Colds, flu, COVID-19, norovirus	Strep throat, urinary tract infections

Common types of viral infection in the UK

The most common types of viral infection in the UK include respiratory viruses, stomach viruses, and viruses that cause a skin rash.

Respiratory viruses

These viruses primarily affect your nose, throat, and lungs. The group includes the common cold, influenza (flu), COVID-19, and Respiratory Syncytial Virus (RSV). The symptoms often overlap but develop differently. For example, a cold usually builds up gradually with a runny nose and mild sore throat. In contrast, flu and COVID-19 tend to have a more sudden onset with a higher fever, severe body aches, and significant fatigue, as noted by GOV.UK.

Stomach viruses (gastroenteritis)

Stomach viruses primarily target the digestive system. Norovirus and rotavirus are the most common examples in the UK. Norovirus commonly causes nausea, vomiting and diarrhoea, and it may also cause a fever, abdominal pain and aching limbs, according to GOV.UK. These infections are highly contagious and usually pass within a few days, provided you stay well hydrated.

Viruses that can cause a rash

Some common viruses have a skin rash as a defining symptom. Chickenpox, caused by the varicella-zoster virus, produces intensely itchy blisters. Measles starts with cold-like symptoms before a distinctive spotty rash appears. Slapped cheek syndrome, caused by parvovirus B19, creates a bright red rash on the cheeks and is usually a mild viral infection that clears up by itself within 1 to 3 weeks, as described by NHS inform.

How to manage viral infection symptoms at home

You can manage viral infection symptoms at home by prioritising rest, maintaining hydration, using over-the-counter medicines safely, and trying simple soothing remedies.

The foundations of recovery: rest and hydration

Rest is a non-negotiable part of getting better. When you sleep and rest, you allow your body to direct its energy towards your immune system. Hydration is equally essential to replace fluids lost through sweating, vomiting, or a runny nose. Drink plenty of water, clear broths, or use oral rehydration solutions if you have a stomach bug. Dark urine or feeling dizzy when you stand are signs you might be dehydrated and you need to drink more fluids.

A woman in a chunky blue knit sweater holds a small yellow pill up to her mouth.

Using over-the-counter medicines safely

Paracetamol and ibuprofen are effective for managing a fever, headaches, and muscle aches. It is important to use them safely. Always check the ingredients in multi-symptom cold and flu remedies, as many already contain paracetamol. Taking a separate paracetamol tablet on top of these remedies can lead to a dangerous accidental overdose. Ibuprofen is not suitable for everyone, particularly if you have asthma or stomach ulcers, so ask a pharmacist if you are unsure.

Soothing specific symptoms

Simple home remedies can ease discomfort while your body fights the virus. For a sore throat, hot lemon and honey drinks or medicated throat sprays offer temporary relief. If you have a cough, staying hydrated helps soothe the irritation. Acute coughs are usually self-limiting, often viral, and may last 3 to 4 weeks, according to NICE. For a blocked nose, saline nasal sprays or breathing in steam from a bowl of hot water can help loosen mucus.

The road to recovery: what to expect after a virus

After a virus, you can expect a recovery period that varies from a few days to several weeks, requiring careful energy management to avoid post-viral fatigue.

How long do viral infections usually last?

A common cold typically lasts for one to two weeks. The flu can leave you feeling drained for several weeks. Some specific viruses take even longer to resolve completely. For instance, glandular fever is a viral infection that usually improves without treatment but may last for several weeks, according to the NHS. Recovery is rarely a straight line, and it varies greatly from person to person.

Pacing yourself to avoid the 'boom and bust' cycle

Pacing is a vital energy management tool during your recovery phase. When you start to feel slightly better, it is tempting to jump straight back into your normal routine. Overdoing it often leads to a crash, forcing you back to bed in a 'boom and bust' cycle. Instead, plan a gradual return to activity. Break your daily tasks into smaller, manageable chunks and schedule regular rest periods in between them.

Managing post-viral fatigue

Post-viral fatigue is a common, frustrating part of recovery. This is the heavy exhaustion that lingers long after your fever and cough have settled. Your body has used immense amounts of energy to fight the infection and needs time to rebuild its reserves. Prioritise getting enough sleep, eat nourishing food, and be patient with your body. If this severe tiredness persists for months, it may develop into chronic fatigue syndrome, and you should speak to a clinician.

When to see a doctor: a traffic light guide for adults

You should see a doctor for a viral infection if your symptoms become severe, persist for more than two weeks, or include warning signs like breathing difficulties or high persistent fever.

Green light: safe to manage at home

Most viral illnesses fall into this category. If you have a runny nose, a mild sore throat, a manageable cough, or a low-grade fever that comes down when you take paracetamol, you can safely look after yourself at home. Ensure you rest and drink plenty of fluids.

Amber light: contact your GP or NHS 111

You need a clinical opinion if your symptoms are worseningor prolonged. Call a GP or NHS 111 if your symptoms are not improving after two weeks, if you have a very high or persistent fever, or if you develop new symptoms like severe earache. You should also seek NHS medical help if your symptoms are concerning or worsening, as advised by GOV.UK.

Red light: seek urgent help (A&E or 999)

Some symptoms are medical emergencies. Viral illnesses warrant immediate medical attention if they are associated with sudden breathing difficulty, according to NHS local services. Go to A&E or call 999 if you experience chest pain, if you are coughing up blood, if you become confused or unusually drowsy, or if you develop a rash that does not fade when you press a glass against it.

Common mistakes and misconceptions about viruses

Common mistakes and misconceptions about viruses include believing that antibiotics will cure them, that you should starve a fever, or that you should push through the illness without resting.

Believing you just need antibiotics

This is perhaps the most frequent misunderstanding our online GPs hear in virtual consultations. Antibiotics only kill bacteria. Viral chest infections usually clear up by themselves, and antibiotics are not effective, according to the NHS. Taking antibiotics unnecessarily will not cure your virus, and it directly contributes to the global problem of antibiotic resistance.

The myth of starving a fever and feeding a cold

This old saying is incorrect. Whether you have a fever or a cold, your body needs energy to fuel your immune response. You should not force yourself to eat heavy meals if you feel nauseous, but consuming light, nutritious food and taking in plenty of calories is important for your recovery. Hydration remains your absolute top priority.

Assuming you should carry on as normal with a cold

Pushing through an illness is a common mistake. Failing to rest forces your body to split its energy between your daily tasks and fighting the infection, which often prolongs the illness. Furthermore, continuing to go to work or socialise while you are infectious increases the risk of spreading the virus to other people, including those who might be vulnerable to severe complications.

Getting the right help for your viral infection

Getting the right help for your viral infection involves resting at home for mild symptoms and contacting a clinician if you experience severe or prolonged illness.

Most viral illnesses can be safely managed at home with plenty of rest and clear fluids. It is important to remember that antibiotics are not a cure for viruses. Recovery takes time, and pacing yourself as you return to normal activities is crucial to prevent long-term fatigue.

Knowing the difference between normal viral symptoms and serious red flags, such as breathing difficulties or a non-fading rash, is your most important tool for looking after yourself safely. If your symptoms are worrying you, if they persist for weeks, or if you simply need reassurance, do not hesitate to seek help. You can book a virtual GP appointment with Doctor Care Anywhere today to speak to an expert clinician and get the right advice.

A man in a light blue hoodie blows his nose into a tissue with his eyes closed, appearing to have a cold or allergies

You can have a viral and bacterial infection at the same time, which is known as a secondary bacterial infection. A common example is a bacterial chest infection or ear infection developing after a viral cold has inflamed your airways. This is why you should contact a doctor if your symptoms suddenly worsen after a period of improvement.

The fastest way to get over a viral infection is to actively support your body's immune system, as there are no shortcuts. This means getting plenty of rest, staying well hydrated with water or clear fluids, and using over-the-counter medicines to manage your symptoms.

You feel so tired for weeks after a virus due to a lingering exhaustion called post-viral fatigue. When you catch a virus, your immune system launches a massive response to fight off the infection, draining your cellular energy stores. Once the virus is gone, your body simply needs time to repair the tissues and replenish that energy.

To tell if it is a cold, the flu or COVID-19, you must look at symptom onset. flu and COVID-19 typically hit you suddenly with a fever, significant body aches, and extreme fatigue. A common cold usually develops more slowly, starting with a tickly throat and a runny nose, and is generally much milder, according to GOV.UK.

Viral Infections: A Guide To Types, Recovery and The GP

What is a viral infection?

Viral vs bacterial infections: what's the difference?