COVID-19 Night Sweats Explained
Night sweats refer to excessive sweating while you sleep, even in a cool room. Many people who caught COVID-19, especially during the Omicron and Delta waves, noticed this symptom. It can happen during the illness and sometimes continue after recovery.
When your body fights an infection like COVID-19, it releases chemicals called cytokines. These raise your body temperature, and sweating helps you cool down. Sometimes, changes in your hormones or metabolism during illness can also lead to excessive sweating.
Night sweats associated with COVID-19 are usually mild and typically subside as the infection improves. But if they continue for a long time or are very bad, they might be caused by something else, such as thyroid problems, menopause, another infection, or side effects from medicines.
It helps to understand why night sweats occur, how to distinguish them from normal sweating, and when to consult a doctor for advice.
What Are Night Sweats?
Night sweats mean sweating a lot while you sleep, even if your room is cool. This is more than just feeling warm under heavy blankets. True night sweats occur due to changes within your body, not because of the temperature around you.
They can be mild, where your clothes feel slightly damp, or more serious, where your bedding gets soaked and your sleep is disrupted. Some people experience them occasionally, while others experience them for several nights in a row.
Night sweats can also come with other signs, such as:
- Fever or chills
- Losing weight without trying
- A cough that will not go away
- Pain or discomfort in certain parts of your body
- Feeling very tired or weak
- Upset stomach or diarrhoea
If you notice these symptoms, it is a good idea to talk to a doctor. Night sweats can have various causes, including infections, hormonal imbalances, or issues with the immune or metabolic systems. Discovering the cause helps you receive the proper treatment.
How To Tell the Difference Between Night Sweats and Regular Sweating
It is essential to distinguish between night sweats and normal sweating, as the causes can be quite different.
Regular sweating helps your body cool down. It can happen for simple reasons such as:
- Exercising before bed
- Sleeping in a warm room or under thick blankets
- Eating spicy food or drinking hot drinks before sleep
- Feeling stressed or anxious
- Having heartburn or acid reflux at night
This kind of sweating is usually mild and stops once you cool down or change your surroundings. Small changes, like lowering the room temperature or using lighter bedding, can often fix it.
Night sweats are different. They are caused by something happening inside your body, not by the temperature around you. They can be linked to infections (like COVID-19, tuberculosis, or HIV), changes in hormones, certain medicines, or long-term health conditions. Unlike normal sweating, night sweats can happen even when your room is cool and you feel comfortable.
If you often wake up soaked in sweat or your sleep is disturbed because of it, your body may be reacting to an internal problem. In that case, it is best to speak with a doctor to determine the cause and receive the appropriate care.
What Causes Night Sweats?
Night sweats can occur for various reasons, ranging from simple hormonal changes to more serious health issues. They occur when your body’s temperature-regulating system becomes overly active. Infections, hormone problems, or side effects from medicines can cause this.
If you frequently experience night sweats, it is essential to consult a doctor. Identifying the underlying cause is the first step in receiving the proper treatment.
Here are some of the most common reasons for night sweats:
Hormone-Related Causes
- Menopaus: Changes in oestrogen levels during menopause can cause hot flushes and night sweats.
- Overactive thyroid (hyperthyroidism): When the thyroid makes too many hormones, your metabolism speeds up, which can make you feel hot and sweaty.
Emotional and Psychological Causes
- Anxiety or stress: When you are stressed, your body releases adrenaline, which raises your heart rate and body temperature.
- Depression: Changes in brain chemicals or the side effects of some antidepressant medicines can cause sweating.
Infections
- Viral Infections: Illnesses like COVID-19 can make your immune system raise your body temperature.
- Tuberculosis (TB) and HIV: These infections are well-known for causing ongoing night sweats, along with fever and weight loss.
Metabolic and Immune Disorders
- Low blood sugar (hypoglycaemia): This can occur at night, especially for individuals who take insulin or diabetes medications.
- Autoimmune diseases: Conditions like rheumatoid arthritis or lupus can cause inflammation and changes in body temperature.
Lifestyle and Environment
- Drinking too much alcohol or caffeine
- Using recreational drugs
- Coming off drugs or alcohol after regular use
- Sleeping in a room that is too warm
Serious Medical Causes
- Cancers such as lymphoma or leukaemia: These can cause heavy night sweats along with tiredness and weight loss.
- Neurological problems or stroke: These can affect how your body controls temperature.
Medicines
Some medicines can cause night sweats, including:
- Antidepressants (like SSRIs or SNRIs)
- Hormone replacement therapy (HRT)
- Methadone (used to treat opioid dependence)
- Diabetes medicines that lower blood sugar
Understanding what might be causing your night sweats can help you and your doctor decide on the best treatment. Sometimes, small lifestyle adjustments can make a significant difference. In other cases, medical care may be needed.
Causes of Night Sweats and Typical Symptom
Properly identifying the cause is key to effective treatment and symptom relief.
| Cause | Category | Symptoms |
|---|---|---|
| Menopause | Hormonal | Hot flashes, irregular sleep |
| Anxiety or Stress | Psychological | Rapid heartbeat, restlessness |
| COVID-19 or Viral Infection | Infectious | Fever, fatigue, chills |
| Tuberculosis or HIV | Infectious | Weight loss, prolonged cough |
| Hyperthyroidism | Endocrine | Tremors, increased appetite, weight loss |
| Cancer (e.g., Lymphoma) | Oncological | Fatigue, weakness, unexplained weight loss |
| Medication Side Effects | Drug-Induced | Sweating linked to new or adjusted prescriptions |
| Hypoglycemia | Metabolic | Nighttime dizziness, shakiness, hunger |
Are Night Sweats Related to COVID-19?
Yes, night sweats can be linked to COVID-19. Many people who caught COVID-19, especially during the Omicron and Delta waves, said they woke up covered in sweat even though their rooms were cool and comfortable.
When your body fights the COVID-19 virus, your immune system releases special chemicals called cytokines. These help defend against the infection but can also raise your body temperature. To cool down, your body produces more sweat, which can lead to intense night sweating.
Night sweats can happen while you have COVID-19 and may sometimes continue for weeks after you recover. This might be due to ongoing inflammation, hormone changes, or effects on the nervous system, which are sometimes seen in people with long COVID.
You should consider testing for COVID-19 if you have new or worsening night sweats along with other symptoms such as:
- Fever or chills
- Feeling tired or achy
- Cough or sore throat
- Loss of taste or smell
- Blocked or runny nose
Most people start to feel better with rest, plenty of fluids, and simple self-care. If your night sweats persist for several weeks or make it hard to sleep, speak with a doctor to rule out other causes.
How To Determine If You Have COVID-19
Because many different conditions can cause night sweats, it’s essential to consider other symptoms that may point to COVID-19. Recognising these early signs can help you take the proper steps to protect yourself and others.
The most commonly reported symptoms of COVID-19 include:
- Fever or chills
- Persistent cough
- Fatigue or body aches
- Headache
- Sore throat
- Shortness of breath
- Loss of taste or smell
- Nausea or vomiting
- Diarrhoea
- Congested or runny nose
If you notice one or more of these symptoms, especially when accompanied by night sweats, consider taking a COVID-19 test. Rapid antigen or PCR testing can confirm infection and help determine whether your symptoms are linked to the virus.
While waiting for results, you should:
- Rest and stay hydrated
- Isolate yourself from others, particularly those at higher risk
- Monitor your temperature and symptoms daily
If your symptoms worsen or if you experience chest pain, difficulty breathing, or persistent fever, seek medical help promptly. Early evaluation can prevent complications and help guide appropriate treatment.
How Are Night Sweats Diagnosed?
If night sweats keep happening or are keeping you from sleeping well, a doctor can help determine what is causing them. The process usually starts with a few questions about your health and habits. Your doctor may ask how often you sweat at night, how long it has been happening, and whether you have other symptoms such as fever, tiredness, or weight loss.
They may also ask about any changes in your lifestyle or new medicines that could be linked to the sweating. A physical check-up can help detect signs of infection, hormonal problems, or other health issues.
If more information is needed, your doctor might suggest:
- Blood tests to check hormone and thyroid levels, and to look for signs of infection or inflammation.
- Imaging tests, such as chest X-rays or ultrasounds if there is a concern about infection or cancer.
- Sleep studies to determine if you might have sleep apnoea or another sleep-related problem.
These tests help your doctor determine whether your night sweats are only temporary or are caused by a condition that requires specific treatment.
What Are the Treatment Options for Night Sweats?
Treatment for night sweats depends on the cause. Once a doctor identifies the reason, the focus is on easing symptoms and treating the underlying problem.
Treating the Cause
- Hormone problems: If night sweats are due to menopause or thyroid issues, hormone-balancing medications may help.
- Infections: When an illness, such as COVID-19, tuberculosis, or HIV, is the cause, treatment usually focuses on fighting the disease with antiviral or antibiotic medicines.
- Mental Health: Stress, anxiety, or depression can lead to sweating. Therapy, relaxation methods, or prescribed medicines can help manage these symptoms.
- Long-term illnesses: For conditions such as diabetes or autoimmune diseases, controlling blood sugar and inflammation can reduce night sweats.
- Rehabilitation: Entering a rehabilitation program if night sweats stem from substance abuse.
Lifestyle and Home Tips
Minor changes to your daily routine can make a big difference:
- Keep your bedroom cool and airy.
- Use light, breathable bedding and sleepwear.
- Avoid caffeine, alcohol, and spicy foods before bed.
- Try to go to bed and wake up at the same time every day.
- Drink plenty of water during the day.
Can Night Sweats Be Prevented?
Not all cases of night sweats can be completely eliminated, but certain habits and minor adjustments can help reduce their frequency and severity. The primary goal is to maintain a steady body temperature, manage stress, and avoid factors that can lead to overheating.
Here are some simple ways to help prevent night sweats:
- Keep your room cool: Set your bedroom to a comfortable temperature and keep airflow good.
- Wear light clothes: Use soft, breathable fabrics like cotton and choose bedding that helps keep you cool.
- Avoid certain foods and drinks before bed: Try not to have caffeine, alcohol, or spicy foods in the evening, as these can raise your body temperature.
- Drink plenty of water: Staying hydrated helps your body control its temperature, especially after exercise or on hot days.
- Relax before bed: Try calming activities like deep breathing, gentle stretches, or meditation to reduce stress.
- Live a balanced lifestyle: Regular exercise, healthy meals, and a steady sleep routine help your body and hormones stay in balance.
These steps often help manage mild night sweats. However, if these issues persist even after making these changes, it is best to consult a doctor for further advice and care.
When Should You See a Doctor?
Sometimes, night sweats are nothing to worry about, but if they persist or are particularly heavy, they could be a sign of another underlying health problem. It is essential to know when home changes are not enough and you should see a doctor.
You should speak to a doctor if:
- Night sweats happen often and stop you from sleeping well
- You also have symptoms like fever, cough, or diarrhoea
- You lose weight without trying or feel tired all the time
- Sweating continues for weeks, even though your room is cool and comfortable
A doctor can ask about your symptoms, run tests if needed, and find out whether the cause is something simple or more serious. Getting checked early can help you feel better faster and prevent further problems.
Mobi Doctor can help you speak with a trusted online doctor from the comfort of your home. Our medical team can assess your symptoms, guide you on possible causes, and recommend the right next steps for care and treatment.
