I haven’t had my period for a month.

If you’ve missed your menstrual period for one month, this is medically referred to as amenorrhea—specifically, secondary amenorrhea when a person who previously had regular cycles experiences the absence of menstruation for at least three consecutive months, or for six months in those with historically irregular cycles. However, even a single missed period warrants thoughtful evaluation, particularly if it’s unexpected or accompanied by other symptoms.

Common and benign causes include pregnancy (the most frequent cause in reproductive-age individuals), significant stress, recent weight loss or gain, intense physical exercise, changes in sleep or circadian rhythm, or initiation or discontinuation of hormonal contraception. Medical conditions such as polycystic ovary syndrome (PCOS), thyroid dysfunction (e.g., hypothyroidism or hyperthyroidism), hyperprolactinemia, premature ovarian insufficiency, or hypothalamic amenorrhea may also underlie a missed period.

We recommend confirming or ruling out pregnancy first with a sensitive urine or serum beta-hCG test. If pregnancy is excluded, consider whether lifestyle factors—such as recent dietary changes, increased training volume, emotional strain, or travel—may be contributing. Persistent or recurrent amenorrhea, especially when associated with symptoms like galactorrhea, headaches, vision changes, hirsutism, acne, or hot flashes, warrants prompt clinical assessment—including targeted history, physical examination, and laboratory testing (e.g., TSH, prolactin, FSH, LH, estradiol, testosterone).

Please consult a healthcare provider for personalized evaluation. Timely investigation helps identify reversible causes and supports long-term reproductive and metabolic health.