These hormones naturally fluctuate throughout your menstrual cycle. Many experts believe PMS happens in response to changing levels of the hormones estrogen and progesterone. That said, researchers have suggested a few different theories. Scientific research hasn’t led to a conclusive cause of PMS, or an explanation for why some people experience it more severely than others. With PMS, you’ll likely also notice some physical symptoms, such as: difficulty concentrating or remembering information.rapid shifts in mood and emotional outbursts.a sad or low mood, which might involve tearfulness or sudden, uncontrollable crying.changes in sleep patterns, including fatigue and trouble sleeping.changes in appetite, including increased food cravings, especially for sweets.anxiety, restlessness, or feeling on edge.PMS-related changes in your mood, emotions, and behavior might include: You might experience only some of the symptoms below, or several, but PMS typically involves at least a few different symptoms. If you have PMS, you’ll experience symptoms consistently before each menstrual period. While PMS often involves mild or moderate symptoms that don’t majorly affect daily life, symptoms can be severe enough to impact your everyday activities and overall well-being.

Insomnia 1 week before period