There might be a number of reasons as to why you are experiencing premenstrual symptoms or PMS but not periods. Nothing in this context is about to worry much although you should stay alert regarding such instances.
Amongst some prominent reasons, here are a few stated-
- Anovulation – Every month the ovary is supposed to release an egg. This induces some hormonal changes in the body leading to premenstrual symptoms. However, this may not be the case every time. The ovary may not release an egg but the body might have already undergone all the premenstrual symptoms and non-occurrence of periods.
- Thyroid disorders – This gland is responsible for regulating the menstrual cycle. Either hypothyroidism (less active thyroid gland) or hyperthyroidism (overactive thyroid gland) may alter the hormonal changes responsible for ovulation. This may lead to PMS but no periods.
- Stress – Although stress does not directly affect your periods but it can lead to an excess level of Cortisol (stress hormone) in your body leading to a hormonal imbalance. This might further affect the ovulation habits. Increased stress level results in the growth of uterine walls. This leads to cramping.
- Birth control aids – The various aids of birth control may alter your menstrual cycle. You may get PMS but won’t counter onto your periods.
- Pregnancy – An unprotected sex may result in pregnancy. Some of the symptoms include breast tenderness, mood swings and cramps. Both hormonal and uterine changes that happen in early pregnancy can affect the same pathways as in menstrual cycle.
- PCOS – Polycystic ovary syndrome is a condition when a person has an excess of androgens in the body. These are chemicals in the body that controls how the ovary functions, hair growth, weight gain and sensitivity to insulin. It can result in anovulatory cycles and irregular spotting. It causes cysts to grow on the ovary, which when ruptures or causes the ovary to twist, may result in a pelvic pain that feels like period cramps.