What Causes Gray Hair?

what causes gray hair

Gray hair happens when your hair follicles stop producing melanin, the pigment that gives your hair its color. This process is driven by genetics and aging, but other factors like oxidative stress, certain medical conditions, and lifestyle choices can speed it up. Most people start seeing gray hairs in their 30s or 40s, though the … Read more

What Systolic Blood Pressure?

what systolic blood pressure

Systolic blood pressure is the top number in a blood pressure reading. It measures the pressure in your arteries when your heart beats and pushes blood out. The bottom number, called diastolic pressure, measures the pressure when your heart rests between beats. Your blood pressure reading has two numbers. The systolic number comes first. A … Read more