What is Alopecia? Alopecia is the general medical term for hair loss. While most commonly associated with the scalp, it can affect your entire body, including eyebrows and eyelashes. Normal vs. Excessive: It is biologically normal to shed 50 to 100 hairs every day as part of the natural growth cycle. However, if you notice distinct bald patches, a receding hairline, or large clumps of hair falling out in the shower, that is classified as excessive loss. Common Types & Symptoms Hair loss isn't "one size fits all." Identifying the specific pattern of loss is the first step in determining the underlying cause. [Image of the human hair growth cycle: Anagen, Catagen, and Telogen phases] 1. Androgenetic Alopecia (Pattern Baldness) This is the most common hereditary type of hair loss, affecting millions worldwide. In Men: Usually begins with a receding hairline that forms an "M" sha...