Why is the heater making me feel sick?

Author: Dr. Jalon Rau MD  |  Last update: Thursday, March 5, 2026

“When your indoor heater is turned on, the air is heated, which in turn lowers relative humidity, making the air inside your home even drier.” Dry air pulls moisture from your body and dries out your skin along with the mucus membranes inside your nose, throat and eyes, explains Checkley.

Why do I feel sick when the heater is on?

Carbon Monoxide: If you're using a gas heater, improper ventilation can lead to carbon monoxide buildup, which is dangerous and can cause symptoms like headaches, dizziness, and nausea.

Can my heater be making me sick?

If you use a gas heater, there is a risk of carbon monoxide exposure if the heater isn't well-maintained. Carbon monoxide is a dangerous, odourless gas that can cause headaches, dizziness, and nausea if inhaled in large amounts. Regular maintenance and good ventilation are essential for safety.

How to treat heater sickness?

“Another option is to keep a bowl of water nearby to reduce the dryness in the room,” she says. Keeping your nasal passages moistened is one way to treat dry sinuses caused by turning on your heater. Dabbing a hypoallergenic lotion on your nostrils or using a saline nasal spray can also help alleviate these symptoms.

Why does running the heat make me sick?

Because hot weather triggers heme oxygenase-1 to speed up the normal breakdown of heme proteins, which releases carbon monoxide, which makes you nauseous.

How To Know If The Heat Is Making You Sick

Why can't I tolerate the heat anymore?

Other factors that make a person susceptible to heat illness include older age, heart disease, other chronic diseases, extreme exercise, sunburn, obesity, sleep deprivation, alcoholism and certain medications.

Why is the heat making me feel sick?

The combination of fluid loss/dehydration from sweating, with lower blood pressure as a result of all those extra dilated blood vessels, can start to lead to more serious problems and can cause dizziness and fainting, or heat syncope.

How long does heater sickness last?

For most people, Lizarzaburu says that, for most people, heater illness symptoms shouldn't last more than a few days.

How do you treat heat sickness?

Heat Exhaustion
  1. Cool, nonalcoholic beverages.
  2. Rest, lying down.
  3. Cool shower, bath or sponge bath.
  4. Air-conditioning.
  5. Get medical help if the symptoms are severe or if the victim has heart problems or high blood pressure.

Why is it hard to breathe when the heater is on?

Radiators heat the air in a room and as the air warms up, it rises in a process known as convection. This causes the warm air to move, which can circulate dust around the room. "If dust is circulated around the room, you can end up inhaling it, which can worsen asthma symptoms," says Jarvis.

Can sitting in front of a heater make you nauseous?

Improperly maintained or faulty fuel-burning heaters can release carbon monoxide gas, which is odourless and colourless. Breathing in high levels of carbon monoxide can lead to carbon monoxide poisoning, resulting in symptoms like headaches, dizziness, nausea, and can even be fatal in extreme cases.

Why does my heater make me dizzy?

Carbon monoxide (CO) is a colorless, odorless, tasteless gas. A by-product of combustion, it can be produced by ordinary appliances, and is a common hazard in the home. Mild exposure can cause symptoms such as nausea, dizziness, or headaches; while severe poisoning can result in brain or heart damage or even death.

Can sleeping under a heater make you sick?

Sleeping with the heater on increases the levels of carbon monoxide in the room. People with heart disease may get chest pain, while smokers with heart disease are particularly at risk, so are young children and elderly. The risk of asphyxia (sleep death) is high when using gas heaters.

What is it called when you feel sick from the heat?

Heat exhaustion is a condition that happens when your body overheats. Symptoms may include heavy sweating and a rapid pulse. Heat exhaustion is one of three heat-related illnesses, with heat cramps being the mildest and heatstroke being the most serious.

Can you get sick from heat in house?

Exposure to these indoor pollutants can cause allergies, asthma, as well as irritation to the eyes, nose, and throat. This problem is more pronounced in warmer climates, such as when your home is heated in the winter. Furthermore, as mentioned above, dust and debris get trapped in the HVAC ducts and vents.

Why do I feel so cold when the heating is on?

Poor circulation

Underlying arterial disease could be causing inadequate blood circulation, making it hard to maintain core body temperature, especially in your extremities. Smoking affects temperature regulation in a similar way by causing blood vessels to constrict.

What are the 3 signs of heat illness?

General Symptoms:

Heavy sweating. Painful muscle cramps. Extreme weakness and/or fatigue.

How do you fix heat intolerance?

Home Care
  1. Drinking plenty of fluids.
  2. Keeping inside room temperatures at a comfortable level.
  3. Limiting how much time you spend outdoors in hot, humid weather.

What deficiency causes heat intolerance?

Yes, low estrogen levels can cause heat intolerance, particularly in women experiencing perimenopause or menopause. Estrogen plays a key role in regulating body temperature and can lead to symptoms such as hot flashes and night sweats when levels are low.

Why does the heater make me feel sick?

One of the most common reasons for heater sickness is unclean air. The EPA estimates that indoor air can be between 2 and 5 times more polluted than the air outside, and a faulty heater can ramp up those pollutants in no time.

How do you know if the heat is making you sick?

Heatstroke
  • Confusion or agitation.
  • Loss of consciousness.
  • Profuse sweating or hot, dry skin.
  • Muscle twitching or seizures.
  • Rapid breathing.
  • Rapid pulse.
  • Very high body temperature.

Why can't I tolerate heat?

Conditions that can cause heat intolerance.

You may develop this symptom if you have an anxiety disorder, if you're in menopause, or if you have thyrotoxicosis (when your thyroid gland makes too much thyroid hormone) from any condition, like hyperthyroidism.

How to treat heat sickness?

Lay the person down and raise the legs and feet slightly. Remove tight or heavy clothing. Have the person sip chilled water, a sports drink containing electrolytes or another nonalcoholic beverage without caffeine. Cool the person by spraying or sponging with cool water and fanning.

Why does my body react badly to heat?

Heat intolerance is also called heat hypersensitivity. It happens when your body does not regulate its temperature correctly and cannot maintain a balance between cold and hot. Heat intolerance causes a more extreme reaction than many people's discomfort when temperatures rise.

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