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People across north London and throughout the UK are being urged to take extra care as extreme heat warnings come into force, with temperatures expected to reach dangerous levels in some areas. While this extreme weather can affect anyone, it can have a particular impact on mental health as well as physical wellbeing. The effects will vary from person to person depending on factors such as age, underlying health conditions, and the medications they may be taking, including those used to manage mental health conditions, which can affect how the body responds to heat and increase the risk of becoming unwell. Extreme heat warnings are in place across the UK, including London from the Met Office in response to forecasts reaching 39-40°C in some locations and from the UK Health Security Agency, whose own red heat-health alert indicates a risk of life.

Why extreme heat matters for mental health and what you can do

Hot weather can affect anyone, but it can have a greater impact on people living with mental health conditions, particularly those taking certain medications.

Some medications commonly used to treat conditions such as depression, anxiety, bipolar disorder and schizophrenia can affect how the body responds to heat. This includes antipsychotics and some antidepressants, where one of the side effects is that it may be harder for the body to regulate its temperature.

These medicines may also:

• Reduce your ability to feel thirsty
• Increase sweating
• Make your skin more sensitive to sunlight

In hot weather, this can increase the risk of dehydration, dizziness, headaches, fainting and heat exhaustion.

There is also evidence that some medications affect the part of the brain that controls body temperature, which can make it harder to stay cool.

For people taking SSRIs, which are a commonly prescribed type of antidepressant, excessive sweating can be a side effect, which may become even worse during a heatwave.

It’s important to remember that not everyone will be affected in the same way, but being aware of the risks can help you take steps to stay safe.

Important advice if you take medication

If you take medication for your mental or physical health:

• Do not stop taking your medication suddenly without speaking to a healthcare professional
• If you feel unwell or notice new side effects, seek advice from your GP, pharmacist or care team
• Make sure you drink plenty of fluids, even if you don’t feel thirsty
• Take extra care to stay cool and avoid overheating

How to stay safe in hot weather

The following simple steps can help reduce your risk during extreme heat:

• Stay out of direct sunlight, especially during the hottest part of the day
• Wear loose, light clothing and a hat when outside
• Use a high-factor sunscreen to protect your skin 
• Keep your home cool by closing curtains and windows during the day
• Avoid strenuous activity and alcohol
• Take cool showers or baths to lower your body temperature 

Looking out for yourself and others

Extreme heat can also affect how people feel emotionally. Some people report increased anxiety, irritability or difficulty coping during very hot weather. Significantly reduced sleep during hot weather can also lead to exhaustion, which in itself impacts emotions and decision making

If you are struggling:

• Try to stay somewhere cool and calm
• Keep in touch with friends, family or your support network
• Contact your care team if your symptoms worsen

It is also important to check in on people who may be more at risk, including older people, neighbours, those with pre-existing health conditions, and those taking medication.

Cool spaces across London - and not that new cocktail bar or outdoor swimming spot

Cool spaces are indoor places where people can escape the heat, rest and cool down during hot weather. They can help reduce health risks, but they are not a substitute for medical care or designed to support those who are unwell. These locations, along with some shaded outdoor spaces, are listed on a seasonal map available from 1 June to 30 September. Click here to view the interactive map.

Read more: 

• Update from our CEO Jinjer Kandola