Many people facing hair loss also experience scalp conditions that can trigger shedding or make existing hair problems worse. In this section, we’ll cover some of the most common scalp disorders, including the difference between dandruff and seborrheic dermatitis, how scalp psoriasis can cause scaling and inflammation, and why contact dermatitis develops when the skin reacts to certain products or ingredients. Understanding these conditions is the first step to calming irritation, protecting your follicles, and creating a healthier scalp environment that nurtures fuller, healthier, longer-lasting hair.