As temperatures rise across the UK, many people look forward to spending more time outdoors. However, hot weather can pose additional risks for people living with certain health conditions or taking specific medications.

Heatwaves place extra strain on the body, increasing the risk of dehydration, heat exhaustion, heatstroke, and the worsening of existing medical conditions. Understanding these risks can help you stay safe and well during periods of extreme heat.

Why Hot Weather Can Be Dangerous

Our bodies regulate temperature primarily through sweating. However, dehydration, certain medical conditions, and some medications can make it harder for the body to cool itself effectively.

This can lead to:

• Dehydration
• Dizziness and fainting
• Heat exhaustion
• Heatstroke
• Worsening symptoms of existing conditions
• Medical emergencies requiring urgent treatment

Health Conditions Affected by Hot Weather

Heart Conditions

People living with heart conditions can be particularly vulnerable during heatwaves. High temperatures cause blood vessels to widen, which can lower blood pressure and force the heart to work harder. Excessive sweating can also lead to dehydration, placing additional strain on the cardiovascular system.

This includes people living with:

• Heart failure
• Coronary heart disease
• Arrhythmias
• High blood pressure

Seek medical advice if you experience symptoms such as chest pain, palpitations, dizziness, or unusual shortness of breath.

Diabetes

Heat can affect both blood glucose levels and diabetes medications. Dehydration may increase blood sugar concentration, while high temperatures can alter insulin absorption and affect glucose control.

During hot weather:

• Monitor blood glucose levels more frequently
• Stay well hydrated
• Store insulin according to manufacturer guidance
• Watch for signs of heat exhaustion and dehydration

Dementia and Cognitive Conditions

People living with dementia may be less aware of rising temperatures, forget to drink enough fluids, or struggle to recognise the signs of dehydration and heat-related illness.

Family members and carers should encourage regular hydration, provide cool environments where possible, and monitor for confusion, dizziness, or unusual lethargy.

Respiratory Conditions

Hot weather, especially when combined with high pollen counts, pollution, or poor air quality, can worsen breathing difficulties.

People living with asthma, COPD, and other respiratory conditions should ensure their medication is readily available and follow their healthcare professional's advice for managing symptoms.

Epilepsy

For some people, heat, dehydration, disrupted sleep, and physical exertion can increase seizure risk.

Maintaining hydration, avoiding excessive heat exposure, and taking medications as prescribed can help reduce potential triggers.

Neurological Conditions

Conditions such as Parkinson's disease and Multiple Sclerosis (MS) can affect the body's ability to regulate temperature.

Many people report worsening symptoms during hot weather, including:

• Increased fatigue
• Muscle weakness
• Balance difficulties
• Cognitive changes

Taking regular breaks in cool environments and avoiding prolonged heat exposure can help manage symptoms.

Postural Orthostatic Tachycardia Syndrome (POTS)

People living with POTS often find hot weather particularly challenging. Heat causes blood vessels to widen, increasing blood pooling in the lower body and potentially worsening symptoms such as:

• Dizziness
• Rapid heartbeat
• Fatigue
• Brain fog
• Fainting

Dehydration can significantly worsen symptoms, making hydration and electrolyte management especially important during heatwaves.

Autism

Many autistic people experience sensory sensitivities that can make hot weather particularly uncomfortable or distressing. Increased sensitivity to heat, humidity, bright sunlight, clothing textures, and changes in routine can all contribute to additional stress during a heatwave.

Some autistic people may also find it difficult to recognise or communicate that they are becoming overheated or dehydrated. Planning, encouraging hydration, and providing access to cool, quiet spaces can help reduce discomfort and support wellbeing.

Medications That May Increase Heat-Related Risks

Certain medications can affect the body's ability to regulate temperature, stay hydrated, or maintain blood pressure.

These include:

Diuretics ("Water Tablets")

Often prescribed for heart failure and high blood pressure, diuretics increase fluid loss and can raise the risk of dehydration.

Beta Blockers

These medications can reduce the body's ability to increase blood flow to the skin, making it harder to cool down efficiently.

Antidepressants

Some antidepressants can affect sweating and temperature regulation, increasing the risk of overheating.

Antihistamines

Certain antihistamines may reduce sweating and contribute to dehydration during hot weather.

Antipsychotic Medications

These medicines can interfere with the body's temperature control mechanisms, making heat-related illness more likely.

Insulin and Diabetes Medications

Heat can alter how the body absorbs and uses insulin, affecting blood glucose management.

If you are concerned about how your medication may interact with hot weather, speak to your GP, pharmacist, or specialist healthcare professional.

Staying Safe During a Heatwave

Simple precautions can make a significant difference:

• Drink water regularly, even if you do not feel thirsty
• Avoid excessive alcohol
• Stay indoors during the hottest part of the day where possible
• Wear light, loose-fitting clothing
• Use shade, fans, or cool rooms to lower body temperature
• Check on vulnerable family members, friends, and neighbours
• Store medications according to manufacturer recommendations

Be Prepared in an Emergency

In an emergency, every second counts. If you become unwell due to heat-related illness, healthcare professionals need quick access to important medical information.

A MedicAlert ID provides immediate access to your vital medical details, helping emergency responders make informed treatment decisions when you may be unable to communicate.

Whether you live with a heart condition, diabetes, epilepsy, POTS, dementia, autism, severe allergies, or another medical condition, carrying your medical information can provide reassurance for both you and your loved ones.

Stay Safe This Summer

Heatwaves can affect anyone, but for people living with certain conditions or taking specific medications, the risks can be greater.

By staying hydrated, recognising the warning signs of heat-related illness, and ensuring your medical information is always accessible, you can enjoy the summer more safely and confidently.

Here's how Cici deals with the heatwave