When Your Period Is a Signal Worth Acting On

Three distinct patterns — periods stopping, periods that are severely painful, and periods that are unusually heavy — each have their own common causes and their own thresholds for when to seek care.

Amenorrhea: When Periods Stop

Periods stopping for three or more months without pregnancy has a range of possible causes — PCOS (Section 4), significant stress, thyroid dysfunction, and, notably for athletic women, low energy availability. A consensus statement on Relative Energy Deficiency in Sport describes how insufficient energy intake relative to training demands — sometimes without any obvious weight loss — can disrupt menstrual function, alongside impairments to bone health, immunity, and cardiovascular health, even in athletes who appear otherwise healthy[7]. This is a genuinely under-recognised cause: amenorrhea in an athletic woman is sometimes wrongly treated as simply "normal for someone who trains hard" rather than investigated as a specific, correctable energy-availability problem.

Dysmenorrhea: Period Pain That Has Real Treatment Options

A comprehensive Cochrane review of NSAIDs for primary dysmenorrhea (period pain without an underlying condition like endometriosis) found them substantially more effective than placebo, with roughly 45–53% of women achieving moderate-to-excellent pain relief on an NSAID compared to around 18% on placebo[8]. This is a genuinely strong effect for a widely available, inexpensive medication — the practical implication being that severe monthly pain isn't something to just tolerate when an effective, accessible treatment exists; it's worth ensuring appropriate use of NSAIDs specifically (starting at the onset of pain or bleeding, at an adequate dose) before assuming nothing more can be done, and worth investigating further if NSAIDs don't help, since that can itself be a signal of an underlying condition like endometriosis.

Heavy Bleeding

"Heavy" is genuinely subjective, but bleeding that soaks through protection every hour or two for several consecutive hours, includes large clots, or causes symptoms of anaemia (fatigue, dizziness, shortness of breath) meets a reasonable clinical threshold for investigation. Common causes range from hormonal imbalance to fibroids (non-cancerous growths in the uterus) to, less commonly, bleeding disorders — and effective treatments exist across that whole range, from hormonal approaches to procedural options, which is why heavy bleeding is worth a specific conversation rather than an assumption that it's simply "how you are."