Why do I experience abdominal pain before my period?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Abdominal pain before your period, often called premenstrual cramps, is very common and typically caused by hormonal shifts and uterine changes as your body prepares to shed its lining. Rising and falling levels of estrogen and progesterone, along with prostaglandins that trigger uterine contractions, are the main reasons you may feel cramping, bloating, or aching in the days leading up to menstruation.

While mild discomfort is normal, severe or unusual pain can sometimes signal an underlying condition like endometriosis, fibroids, or an ovarian cyst. Because symptoms overlap with many conditions, guessing can leave you worried or delay proper care. A free, instant, online symptom check can help you understand what's driving your discomfort, identify possible causes based on your specific symptoms, and guide you on whether self-care or a doctor's visit is the smartest next step.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Many people feel belly pain before their period, and this is often caused by cramps. Your uterus starts to contract as it gets ready to shed its lining, and these contractions can hurt. This pain is called dysmenorrhea, and it is very common.

Changes in hormones before your period can also affect other parts of your body, like your stomach and intestines, making them cramp too. This can sometimes be part of a mix of symptoms known as premenstrual syndrome (PMS). Sometimes, the pain is mild and goes away when your period starts. Other times, it might be more noticeable and uncomfortable.

To help with the pain, you might try resting, using a warm heat pad on your lower belly, or doing gentle stretches or walks. If the pain is very strong every month, you can use our free symptom checker to better understand your symptoms, and it is a good idea to talk with a healthcare provider for pain management recommendations and to determine whether additional testing might be needed.

(References)

Avant RF. Dysmenorrhea. Prim Care. 1988 Sep;15(3):549-59. PMID: 3054962.
Gudipally PR, Sharma GK. Premenstrual Syndrome. 2023 Jul 17. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–. PMID: 32809533.
Velho RV, Werner F, Mechsner S. Endo Belly: What Is It and Why Does It Happen?-A Narrative Review. J Clin Med. 2023 Nov 19;12(22):7176. doi: 10.3390/jcm12227176. PMID: 38002788; PMCID: PMC10671958.

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