One of the more particularly unflattering aspects of aging is hair loss, or alopecia. There are several different forms of alopecia, including male and female pattern hair loss, alopecia areata, and telogen effluvium. I will spend some time explaining these different types, but there are many other causes too, including infection (e.g. bacteria, fungus, mites), trauma, chronic disease (e.g. diabetes, cancer), and as a side-effect of pharmaceutical drugs (e.g. chemotherapy, steroids). While hair loss is not uncommon, and is often temporary, if you experience unexplained hair loss it's always a good idea to get a diagnosis to rule serious causes. As a symptom, hair loss can tell us a lot about what is happening in the body. Before delving into the causes of hair loss, it's a good idea to review both modern and ancient ideas about the structure and function of hair. Science tells us that hair are projections of the skin (epidermis), composed of dead keratinized cells bonded together by … [Read more...]