Stomach bug at home: managing vomiting and loose motions

A bad stomach is one of the most common reasons families in Bengaluru reach for help during the rains. Vomiting and loose motions are unpleasant and tiring, but for most healthy adults they settle within a day or two with simple home care. This guide will help you know what to do, what to watch for, and when a stomach bug needs a doctor.

This is written for families by an MBBS-qualified doctor with a postgraduate degree in community medicine. It is general guidance, not a replacement for a doctor examining the person who is unwell. Babies, young children, the elderly, and anyone with diabetes or a long-term illness can become unwell faster, so please involve a doctor early for them rather than waiting things out.

Why monsoon brings more stomach trouble

When the rains come, water and food are more easily contaminated. Overflowing drains and standing water let germs reach drinking water and street food. A cut salad, a reheated meal left out too long, or water from an uncertain source can carry the bug that gives you a churning stomach a day later.

Most of this is ordinary gastroenteritis or mild food poisoning — the body clearing out something it did not like. It is miserable but usually short-lived. The real danger is rarely the bug itself; it is the fluid you lose through vomiting and loose motions. That is why rehydration, not medicine, is the heart of home care.

Rehydration comes first

Replacing lost fluid and salts is the single most important thing you can do. Plain water alone is not enough when motions are frequent, because the body is also losing salts.

• Use ORS the right way. Oral rehydration solution (ORS) is the proven choice. Mix one full sachet into the exact amount of clean water printed on the packet — usually one litre. Do not make it stronger or weaker, and do not add sugar or salt of your own. Make a fresh batch each day.
• Small sips, often. After each loose motion or vomit, offer a little ORS. Frequent small sips stay down far better than a large glass at once, especially when there is nausea.
• Good fluids to offer. ORS first, then coconut water, thin dal water, rice kanji, buttermilk, or clear soups — these give both fluid and some salts.
• Avoid only-sugary drinks. Soft drinks, packaged juices, and very sweet sherbet can pull more water into the gut and worsen loose motions. They are not a substitute for ORS.
• The aim is pale, regular urine. If urine is passing normally and light in colour, hydration is on track.

Signs of dehydration to watch for

Dehydration is the main thing that turns an ordinary stomach bug into something serious. Babies, young children, and the elderly dehydrate fast — sometimes within hours — so watch them especially closely. Early signs in an adult include:

• Increasing thirst and a dry mouth
• Passing less urine than usual, or darker urine
• Tiredness, light-headedness, or feeling dizzy on standing
• In a baby or young child: fewer wet nappies, crying with few or no tears, unusual sleepiness or fussiness

If you notice these early signs, step up the ORS and keep a close eye. If they keep worsening despite your efforts, that is the point to involve a doctor.

Simple eating, then back to normal

Food matters less than fluids in the first day, and a poor appetite is normal. You do not need to starve.

• Once vomiting eases, start with small amounts of bland, simple food — khichdi, curd rice, plain rice, idli, banana, or toast — and see how the stomach responds before having more.
• Avoid oily, spicy, or rich food, and skip milk-heavy or fried items for a day or two.
• As you feel better, return to your normal diet as soon as you comfortably can — there is no need to stay on bland food for days once the stomach has settled.

A careful word on anti-diarrhoeal medicines

It is tempting to reach for a tablet to stop the motions, but this needs care. Loose motions are partly how the body clears the infection, and the medicines that slow them can sometimes do more harm than good.

• Over-the-counter anti-diarrhoeals should be used sparingly, if at all, and only by otherwise healthy adults.
• Do not give them to babies or young children. For little ones, rehydration is the treatment — leave any medicine decisions to a doctor.
• Avoid them when there is blood in the stool or a high fever. In those situations, slowing the gut can be dangerous, and the illness needs a proper diagnosis, not a tablet that masks it.
• When in doubt, focus on ORS and rest, and ask a doctor before using any anti-motion medicine.

When it can wait, with watching

For a healthy adult, a stomach bug can usually be watched at home if the person is keeping fluids down even while eating little, passing urine normally, alert and able to move about, and at least not clearly worsening over the first day. Keep offering ORS, rest, and simple food, and the bug will most often clear within a day or two.

When a doctor is the right call

Plenty of stomach bugs do not need a hospital, but they do need a proper look — and sometimes a test. A home visit suits this well: getting a weak, dehydrated person seen without a tiring trip to a crowded waiting room.

Consider booking a doctor home visit if:

• The vomiting or loose motions last beyond about two days without clearly improving
• The person cannot keep fluids down despite small, frequent sips
• It is a baby, young child, pregnant woman, or an elderly person — they dehydrate quickly and need a lower threshold for review
• The person has diabetes, kidney, heart, or liver problems — illness and fluid loss can upset these conditions
• You simply cannot tell how serious it is and want a trained eye before deciding

A home doctor can check how dehydrated the person is, arrange a stool or blood test if needed, advise on safe medicines, and tell you plainly whether this can stay at home or needs admission. Every doctor on JanaVaidya has their degree, specialisation, and council registration shown to you before you book. You can see how this works on our how it works page.

Red flags — call 108 or go to hospital now

Some signs mean the situation has crossed from “watch at home” into an emergency. If any of these appear, do not wait for morning and do not wait for a home visit — call 108 or go to the nearest hospital straight away:

• Signs of severe dehydration — very little or no urine over many hours, sunken eyes, no tears when crying, extreme drowsiness or being hard to wake, and in a baby a sunken soft spot on the top of the head
• Blood in the vomit or stool, or black, tarry stools
• Severe or constant stomach pain that does not ease
• Persistent vomiting where nothing at all stays down
• High fever with a stiff neck, confusion, or unusual drowsiness

A high fever that goes on for several days alongside a stomach upset can sometimes be typhoid, which spreads through contaminated water and food and is more common in the monsoon. Typhoid needs a blood test to confirm and proper treatment — it will not simply pass with ORS. If high fever is part of the picture, read our note on typhoid symptoms and treatment in Bengaluru and have a doctor review the case. For a wider view of the season, our guide to monsoon illnesses in Bengaluru may also help.

A quick caregiver checklist

Keep this within reach for the next few days:

1. ORS after every loose motion or vomit — small sips, often, made fresh each day
2. Watch urine — pale and regular means hydration is holding
3. No anti-motion medicines for children, or when there is blood or high fever
4. Bland food once vomiting eases, then back to normal as appetite returns
5. Babies, young children, and the elderly — lower threshold to call a doctor
6. Blood in vomit or stool, severe stomach pain, no fluids staying down, or signs of severe dehydration — hospital now

Most stomach bugs pass quickly, and steady rehydration and rest are usually all that is needed. But you should never have to guess alone, especially with a young child or an older parent. If you would like a doctor to look in on someone who is unwell, learn more on our for patients page or reach us here. We hope it settles soon. If it does not, we will come.