PMS fatigue: what to know and how to cope

Hormone changes before menstruation can affect sleep, mood, appetite and the way your body feels. Cramps, bloating or headaches may also make ordinary activities feel more demanding. A pattern that returns in the same part of the menstrual cycle and settles afterwards supports PMS as a possible explanation, but fatigue that continues throughout the month deserves a wider review.

Other causes can include poor sleep, emotional strain, low iron, infection, or an ongoing health condition. Anaemia, thyroid problems and dehydration are examples a clinician may consider. Heavy periods can contribute to low iron, so mention flow that is unusually heavy or prolonged.

Keep a simple cycle diary recording energy, sleep, bleeding, pain and mood. Regular meals, enough fluids, gentle movement and a consistent sleep routine can reduce the load on difficult days. Plan demanding tasks for times when your energy is better, and allow short recovery breaks.

If symptoms interfere with work, study or relationships, arrange a GP assessment. Bring your diary and a list of medicines or supplements. Do not start iron or other supplements without advice, because the cause of fatigue should be checked first.

Seek prompt medical advice if fatigue is new, steadily worsening, present outside the premenstrual phase, or accompanied by fainting, breathlessness, chest pain, confusion, fever or marked weakness. Urgent help is appropriate for severe breathing difficulty, collapse or a sudden change in alertness.

Could my bleeding, sleep or medicines be contributing to fatigue? Do I need an examination or blood tests? What plan could help if symptoms return each cycle?