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Hair dye reactions
Hair dye reactions, also known as allergic contact dermatitis or irritant contact dermatitis, occur when the skin reacts negatively to the chemicals present in hair dye products. These reactions can range from mild itching and redness to more severe symptoms such as blistering, swelling, and even anaphylaxis in rare cases. Understanding the symptoms, causes, and management of hair dye reactions is crucial for preventing and addressing these adverse events effectively.
Haemophilia
A disorder in which blood doesn't clot normally.
When blood can't clot properly, excessive bleeding (external and internal) occurs after any injury or damage.
Symptoms include many large or deep bruises, joint pain and swelling, unexplained bleeding and blood in urine or stool.
Treatment includes injections of a clotting factor or plasma.
Haemochromatosis
Hemochromatosis (he-moe-kroe-muh-TOE-sis) causes your body to absorb too much iron from the food you eat. Excess iron is stored in your organs, especially your liver, heart and pancreas. Too much iron can lead to life-threatening conditions, such as liver disease, heart problems and diabetes. 
Iron overload is usually caused by an inherited condition called haemochromatosis. Excess iron can poison organs, which can lead to conditions such as cancer, irregular heartbeat and cirrhosis of the liver.
Symptoms are related to conditions that arise from iron overload such as diabetes, darkening of the skin, abnormal heart rhythm or arthritis.
Hypotension (low blood pressure)
Hypotension is the medical term for low blood pressure (less than 90/60). A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the pressure in the arteries when the heart beats and fills them with blood. Low blood pressure can have causes that aren't due to underlying disease. Examples include family history of low blood pressure or medication side effects.