Why You Keep Catching Colds and 5 Things That Actually Help

A runny nose, a nagging cough, and several days of feeling under the weather can disrupt your work, sleep, and daily routine. Although the common cold usually resolves on its own, it can be particularly troublesome for older adults, people with chronic health conditions, and anyone who cannot afford to take time off.

The good news is that a few everyday habits may help lower your chances of catching a cold or make symptoms easier to manage if you do become sick.

While no strategy can guarantee that you will stay healthy throughout cold and flu season, evidence suggests that protecting your sleep, improving indoor air quality, washing your hands, limiting exposure to sick people, and exercising regularly can all play a role in supporting your health.

Here are five practical steps to consider.

1. Limit Close Contact With People Who Are Sick

One of the most direct ways to reduce your risk of catching a cold is to limit exposure to people who have respiratory symptoms.

The common cold is caused by respiratory viruses, including rhinoviruses. These viruses can spread through respiratory particles released when an infected person coughs, sneezes, talks, or breathes. Transmission can also occur when contaminated hands touch the nose, mouth, or eyes.

If someone in your household or workplace has a cold, try to maintain some distance when practical, particularly during the first few days of illness.

You can also take steps to protect others if you become sick. Staying home when possible, avoiding close contact, and covering coughs and sneezes can help reduce the likelihood of spreading the virus.

This precaution is especially important around older adults, people with weakened immune systems, and those living with chronic medical conditions.

In situations where avoiding close contact is difficult, a well-fitting, high-quality mask, such as an N95, may offer additional protection when worn correctly.

The goal is not to eliminate every social interaction. Rather, it is to reduce unnecessary exposure and protect people who may be more vulnerable to respiratory infections.

2. Improve Indoor Air Quality

Have you ever noticed how quickly a respiratory illness can spread through a household, office, or crowded indoor space?

Air circulation may be one factor.

Respiratory viruses can spread through particles that remain suspended in the air, particularly in enclosed spaces with limited ventilation. When several people share the same indoor environment, the risk of exposure may increase if someone is infectious.

Improving ventilation can help reduce the concentration of infectious particles in the air.

Whenever practical, open windows to bring in fresh outdoor air, increase ventilation through your home's heating and cooling system, or spend time outdoors rather than in crowded indoor settings.

Portable air cleaners equipped with high-efficiency particulate air (HEPA) filters may also help reduce airborne particles when appropriately sized for the room and used according to the manufacturer's instructions.

Humidity is another consideration, although evidence that changing indoor humidity alone prevents common colds remains limited. Extremely dry air may affect the respiratory tract, but excessive humidity can encourage mold growth.

For most homes, maintaining comfortable humidity, avoiding condensation, and prioritizing good ventilation are sensible steps.

Practical tip: If you are caring for someone with a cold, improve airflow in shared rooms when possible and consider using a suitable air purifier to supplement ventilation.

3. Wash Your Hands at the Right Times

Handwashing remains a simple, accessible way to reduce the spread of many infectious diseases, including some respiratory infections.

Although respiratory viruses can spread through the air, contaminated hands can also transfer viruses to the eyes, nose, and mouth.

The key is to wash your hands at appropriate times rather than worrying about disinfecting every object you encounter.

Important moments include:

• Before preparing food or eating.
• After coughing, sneezing, or blowing your nose.
• After caring for someone who is sick.
• After using the bathroom.
• After returning home from places where you have had contact with many people.

Use soap and clean running water, rubbing all surfaces of your hands for at least 20 seconds before rinsing and drying them.

If soap and water are unavailable, an alcohol-based hand sanitizer containing at least 60 percent alcohol is a useful alternative for routine hand hygiene.

There is no need to obsessively disinfect every package or household object. Instead, focus on consistent hand hygiene and avoiding touching your face with unwashed hands.

These small habits can be especially valuable during periods when respiratory illnesses are circulating widely.

4. Prioritize Seven or More Hours of Sleep

Sleep does much more than help you feel rested. It supports the immune system, which helps your body respond to infections.

When you consistently get too little sleep, your body's ability to maintain normal immune function may be affected.

One frequently cited study published in the journal Sleep examined 164 healthy adults whose sleep habits were monitored before researchers exposed them to a rhinovirus, a virus that commonly causes colds.

The researchers found that participants who slept fewer than six hours per night were more likely to develop a clinical cold than those who slept seven hours or more.

The study was relatively small, and its findings do not mean that everyone who sleeps less than six hours will catch a cold. However, the results support the importance of adequate sleep in respiratory health.

For most adults, the Centers for Disease Control and Prevention recommends at least seven hours of sleep per night, with individual needs varying by age and circumstances.

To improve your sleep habits:

• Keep your bedtime and wake-up time relatively consistent.
• Reduce caffeine intake later in the day if it interferes with sleep.
• Limit bright screens and stimulating activities before bed.
• Keep your bedroom dark, quiet, and comfortable.
• Avoid sacrificing sleep repeatedly to finish work or other tasks.

Sleep is not a guarantee against infection, but it is one of the most accessible habits you can improve without special equipment or expensive supplements.

5. Exercise Regularly to Support Your Overall Health

Regular physical activity benefits cardiovascular health, metabolic function, muscle strength, and general well-being. It may also help your body cope better with illness.

However, an important distinction is necessary: exercising regularly does not guarantee that you will avoid catching a cold.

Research on exercise and respiratory infections has produced mixed findings regarding whether regular physical activity prevents people from becoming infected. Some evidence suggests that physical activity may help reduce the severity or duration of respiratory symptoms, but the results are not conclusive for every population or type of exercise.

Even so, maintaining an active lifestyle remains an important part of healthy aging.

Adults can work toward at least 150 minutes of moderate-intensity aerobic activity each week, along with muscle-strengthening activities on two or more days, in line with general public health recommendations.

You do not need an elaborate fitness program to get started. Brisk walking, cycling, swimming, and other activities you enjoy can help you build a consistent routine.

Strength training can also help preserve muscle mass, which becomes increasingly important as people age.

One important caution: If you are already sick, adjust your activity to how you feel. Rest when you have a fever, significant fatigue, chest symptoms, or other concerning signs. Seek medical advice if symptoms are severe or worsening.

The objective is to build long-term resilience, not to push through illness.

Common Cold Myths: What Really Helps?

Several familiar beliefs about preventing colds sound convincing but are not well supported by scientific evidence.

Does going outside with wet hair cause a cold?

No convincing evidence shows that going outdoors with wet hair directly causes a common cold.

Colds are caused by viruses, not simply by exposure to low temperatures. You need to be exposed to an infectious virus to develop a viral cold.

That said, dressing appropriately for cold weather remains important to prevent cold-related injuries and maintain comfort.

Can megadoses of vitamin C prevent colds?

Taking large doses of vitamin C has not consistently been shown to prevent colds in the general population.

Some research suggests that regular vitamin C supplementation may modestly shorten the duration of a cold, but the benefit is limited. Taking vitamin C after symptoms begin has not consistently demonstrated the same effect.

Getting enough vitamin C through a balanced diet is important, but more is not necessarily better. High supplemental doses can cause digestive problems and may increase the risk of kidney stones in susceptible individuals.

Will extra vitamin D or zinc keep you from getting sick?

Vitamin D plays a role in immune function, and correcting a deficiency is important for health. However, taking additional vitamin D beyond what your body needs is not a guaranteed way to prevent a cold.

Evidence regarding zinc is more nuanced. Certain oral zinc preparations may shorten the duration of a cold when taken early, but results vary by formulation and dose. Zinc can also cause side effects and interact with medications.

Avoid using zinc nasal products because some have been associated with loss of the sense of smell. Prolonged use of high doses of zinc can also interfere with copper absorption.

Before taking high-dose supplements, consult a healthcare professional, especially if you have existing medical conditions or take prescription medications.

Can antibiotics cure a common cold?

No. Antibiotics treat bacterial infections, not viruses such as those that cause the common cold.

Taking antibiotics unnecessarily can cause side effects and contribute to antibiotic resistance.

A healthcare professional may prescribe antibiotics if a separate bacterial infection develops, but ordinary cold symptoms alone do not mean antibiotics are needed.

When Is It More Than a Common Cold?

Although common colds are usually mild, not every respiratory illness is simply a cold.

COVID-19, influenza, and respiratory syncytial virus (RSV) can produce symptoms that overlap with those of a common cold. Influenza, for example, often causes more pronounced fatigue, muscle aches, and fever, although symptoms vary.

Vaccines are available for certain respiratory infections, including influenza and COVID-19, and RSV vaccines are recommended for specific eligible groups. Discuss your individual risk and eligibility with a healthcare professional.

Seek medical advice if you experience difficulty breathing, chest pain, dehydration, a persistent or returning fever, symptoms that improve and then worsen, or symptoms that are unusually severe. Older adults and people with underlying medical conditions may benefit from contacting a healthcare professional early because some treatments work best when started promptly.

The Bottom Line

There is no foolproof way to avoid every common cold, but you can take practical steps to reduce your risk and support your body's ability to cope with respiratory infections.

Start with the habits that make the biggest difference to your daily routine: limit close exposure to sick people when possible, improve ventilation, wash your hands at appropriate times, get enough sleep, and stay physically active.

Be skeptical of products that promise complete protection, and remember that supplements cannot replace basic preventive measures.

Most importantly, consistency matters more than perfection. A few sensible habits practiced throughout the year can help protect your health, reduce avoidable exposure, and make cold season easier to manage.