Hormonal describes things that belong to hormones: the body's own chemical messengers, made in glands, that tell parts of you to grow, sleep, change mood, make milk, start puberty, and so on. A hormonal change is a change those chemicals are driving. Doctors and biology teachers use it quite calmly: hormonal treatment, the hormonal system. In everyday talk, especially about teenagers and about women around a period, people say someone is hormonal when their feelings swing hard and they want a kind body-reason: the chemicals are pushing. That everyday use is common, a bit informal, and it can sound as if only women get it, which is not true — bodies of every kind run on hormones. The tidy picture is about those chemicals. The living picture is that people also use it as a soft word for moody just now, and there is a body reason.