Is sinus caused by cold water, curd or rain?

Short answer: No. Cold water, curd and rain do not directly cause sinusitis. Sinusitis is inflammation with blocked drainage of the sinuses, usually triggered by viral infections, allergies or structural narrowing in the nose. Cold drinks or sudden temperature changes may briefly irritate an already sensitive nose, but avoiding healthy foods is generally not needed.

Key takeaways

• No food, including curd or bananas, has been shown to cause sinusitis.
• Cold air, AC and temperature swings can be triggers that briefly worsen an already irritated nose.
• Unnecessary food restrictions can reduce protein, calcium and overall nutrition.
• If symptoms keep returning, the cause is usually inside the nose, which an ENT can examine.

Dr. Prashanth's perspective

For my patients in Bangalore, I explain that cold food or cold weather can trigger the release of histamine, so there is a higher chance of a stuffy nose and an itchy throat, especially in people who have allergic symptoms. Steam inhalation and saline nasal washing help wash out the mucus and make you feel better.

— Dr. Prashanth R. Reddy, ENT Surgeon, ENTHealth360

Why do people blame curd, cold water and rain for sinus?

These beliefs are common because the timing seems to fit, not because the food or weather is the cause. Many Indian families link curd, bananas, cold water or getting wet in the rain with "sinus".

The sinuses are air-filled spaces around the nose, cheeks and eyes that drain through small openings into the nose. When the lining swells, these openings block, mucus collects and pressure builds. The common starting points are a viral cold, allergy (such as to dust mites or pollen) and structural issues like a deviated septum, the wall dividing the nose, or enlarged turbinates, the shelves of tissue on the side walls of the nose.

The monsoon does bring more sinus complaints, largely because colds and mould allergens rise then.

Trigger or cause: how can you tell the difference?

A cause creates the disease, while a trigger only makes existing symptoms flare for a short while. This distinction helps you decide what to change.

• Possible triggers: cold drinks, AC rooms, a cold breeze on a two-wheeler, dust and smoke.
• Usual causes: viral or bacterial infection, allergic inflammation, nasal polyps, a narrow drainage pathway or a dental infection near the upper teeth.

Brief stuffiness after a cold drink is a sensitive lining reacting. Weeks of blockage, thick discharge or reduced smell, whatever you eat, mean something else is driving the inflammation.

What can you do at home without cutting out healthy foods?

Focus on keeping the nasal lining calm and the drainage moving, rather than banning foods. Simple steps that are generally safe include:

• Saline rinse once or twice a day, using sterile, distilled or boiled-and-cooled water.
• Room-temperature drinks during an active flare if cold drinks bother you; there is no need to avoid curd at mealtimes.
• Reduce allergen exposure: wash bedding in hot water, keep rooms dry during the monsoon to limit mould, and wear a mask on dusty commutes.
• Keep a short diary for two weeks. If one specific food clearly worsens symptoms every time, discuss it with your doctor before stopping it.

Curd provides protein, calcium and beneficial bacteria; long-term bans can affect nutrition, especially in children.

How breathing, sleep and energy are connected here

A blocked nose matters more than people expect, because it often changes how you breathe at night. When the sinuses and nasal passages are swollen, many people switch to mouth breathing during sleep. This can lead to a dry throat, snoring and lighter, more broken sleep.

Patients often report feeling unrefreshed, with foggy concentration at work or during studies. Addressing the real cause of nasal blockage, rather than the food on your plate, is often the first step towards breathing comfortably, sleeping more deeply and feeling steadier through the day.

How does nose breathing support energy and BMR?

Your basal metabolic rate (BMR) is the energy your body burns at rest to keep the heart beating, the brain working and cells repairing. Your cells make that energy using oxygen, so how well you breathe matters.

Nose breathing helps in two ways:

• Warm, moist, filtered air. The nose warms, humidifies and filters each breath before it reaches the lungs. Conditioned air is gentler on the airway lining, which matters in Bangalore's air-conditioned offices and traffic dust. Mouth breathing skips this step and can leave the throat and airways dry.
• Nitric oxide from the sinuses. The paranasal sinuses continuously make nitric oxide (NO), a natural gas. When you breathe in through your nose, small amounts of this NO travel to the lungs, where studies suggest it may help widen tiny blood vessels and improve oxygen uptake. Mouth breathing largely bypasses it.

Nose breathing does not "boost" your BMR. That is set mainly by muscle mass, age, body size and hormones such as thyroid. But comfortable nasal breathing by day, and undisturbed breathing at night, support efficient oxygen supply and deeper sleep, which your body needs to use energy well and recover.

A simple check: sit quietly and breathe through your nose with your mouth closed for two minutes. If that feels difficult, or one side is always blocked, it is worth having your nose examined.

When should you see an ENT?

See an ENT if symptoms last more than a few weeks or keep coming back. In particular:

• Nasal blockage or discharge lasting longer than 10 to 12 weeks.
• Three or more sinus episodes in a year, or repeated antibiotic courses.
• Reduced or lost sense of smell.
• Blockage or bloody discharge on one side only.

Seek urgent medical care the same day for swelling or redness around the eye, double vision or reduced vision, severe headache with a stiff neck, confusion or a very high fever.

How an ENT evaluates and treats it

An ENT looks for the real cause inside the nose rather than relying on food history alone. A nasal endoscopy, a thin camera passed gently into the nose after a numbing spray, can show swelling, pus, polyps or a deviated septum in a few minutes.

A CT scan is advised only when it will change the plan. Treatment may include saline irrigation, steroid nasal sprays, allergy management and, when infection is likely, appropriate medicines. Persistent structural problems may need endoscopic procedures. The right option depends on the cause.

Frequently asked questions

Does nose breathing give me more energy? It does not add energy by itself, but it delivers warm, humidified air and sinus nitric oxide to the lungs, which may help oxygen uptake. Together with better sleep, that supports the energy your body uses at rest (BMR) and during activity.

Should I avoid curd at night if I have sinusitis? There is no good evidence that curd at night causes or worsens sinusitis. If you personally notice a clear pattern, you can adjust timing, but there is no need to stop it altogether.

Can getting wet in the rain give me sinus? Not directly. Colds spread more in the monsoon and can lead to sinusitis, so hand hygiene matters more than avoiding rain.

Does AC make sinus worse? Cold, dry AC air can irritate a sensitive nose. A moderate temperature, hydration and saline sprays may help.

References

• Lundberg JO, Farkas-Szallasi T, Weitzberg E, et al. High nitric oxide production in human paranasal sinuses. Nature Medicine. 1995;1(4):370-373.
• Lundberg JO, Settergren G, Gelinder S, et al. Inhalation of nasally derived nitric oxide modulates pulmonary function in humans. Acta Physiologica Scandinavica. 1996;158(4):343-347.
• Keck T, Leiacker R, Heinrich A, Kühnemann S, Rettinger G. Humidity and temperature profile in the nasal cavity. Rhinology. 2000;38(4):167-171.

About the author

Dr. Prashanth R Reddy is an ENT surgeon at ENTHealth360, Bangalore (MS ENT; MBA, IIM Bangalore; Seoul Rhinoplasty Fellowship), seeing patients at Sakra World Hospital, Marathahalli and in Koramangala. His practice focuses on how breathing affects sleep, energy and everyday performance.

Related reading: Sinusitis: Causes, Symptoms, Home Care & When You Need an ENT (Bangalore Guide)

For educational purposes only. Not a substitute for medical advice. Please consult a qualified ENT specialist.