Hot weather doesn't just cause sweating and fatigue—it can also affect your cardiovascular system. During heatwaves, the body undergoes major changes to regulate temperature, and this can lead to blood pressure fluctuations , especially in people with hypertension, heart disease, or dehydration.
Excessive sweating during hot weather leads to fluid loss. When the body becomes dehydrated, blood volume drops, forcing the heart to work harder, which can trigger sudden changes in blood pressure.
To cool the body, blood flow increases toward the skin and the heart pumps faster. This added workload can be risky for people with pre-existing heart or blood pressure conditions.
High temperatures cause blood vessels to dilate. This can sometimes lead to lower blood pressure, resulting in dizziness, fainting, or weakness.
In certain individuals, especially during heat stress combined with dehydration or exertion, blood pressure may actually rise due to strain on the heart and poor temperature regulation.
Some medications for hypertension, heart disease, or fluid retention can affect how the body handles heat, increasing the risk of blood pressure instability during heatwaves.
Do not ignore these symptoms during extreme heat:
These may indicate heat-related illness or blood pressure imbalance.
Certain groups are more vulnerable:
Simple preventive steps can reduce risk: