Periods reduced from 5 days to 2–3 days — is it normal?

Shorter periods are often entirely normal. Flow naturally changes across life, and duration commonly shortens with age, after stopping hormonal contraception, with weight change, or simply as a variation with no cause to find. When it is worth investigating: if the change was sudden rather than gradual, if it followed a uterine procedure such as a D&C or surgery, or if it came with new pain or difficulty conceiving. The reason procedures matter is Asherman's syndrome — adhesions inside the uterine cavity that can form after instrumentation and reduce the lining available to shed. It is uncommon but treatable, and a sudden drop in flow after a procedure is its most typical presentation. Other possibilities include a thin endometrium, approaching perimenopause, or thyroid dysfunction. If you are trying to conceive, or the change was abrupt, see a gynaecologist. A pelvic ultrasound assessing lining thickness is the usual first step, with hysteroscopy if adhesions are suspected. A gradual shortening with no other symptoms rarely needs any action.