Diagnostic method: 1. The menstrual cycle is basically normal, the amount of menstruation is obviously reduced, and even the drip is clean, which is more common in the later period of menstruation. 2. Some drugs can cause oligomenorrhea, such as birth control pills, psychotropic drugs, anti-tumor drugs, drugs for the treatment of endometriosis (such as tamoxifen, danazol, namidone, etc. ), and drugs such as tripterygium wilfordii tablets and bromocriptine can also cause menorrhagia. 3. Repeated induced abortion or rough surgery will damage the endometrium or uterine cavity adhesion of the uterine basal layer, resulting in oligomenorrhea, so you should also ask about the abortion operation. Postpartum hemorrhage sometimes manifests as less menstrual flow and then amenorrhea. 4. Anovulatory dysfunctional uterine bleeding with simple oligomenorrhea is rare, and sometimes it is a precursor to anovulatory amenorrhea. Polycystic ovarian syndrome can also be seen as oligomenorrhea, often accompanied by late menstruation, weight gain, and then amenorrhea. Premature ovarian failure is also characterized by less menstrual flow and then amenorrhea. 5. Patients with less menstrual flow and late menstruation should first rule out abortion or ectopic pregnancy, and urine, blood pregnancy test and B-ultrasound can be distinguished.

Four types of blood deficiency, kidney deficiency, blood stasis and phlegm-dampness:

Blood deficiency:

After a small amount of menstruation or dripping, it is clean, pale, dizzy, palpitation and fatigue, pale complexion and empty abdomen. The tongue is pale and the pulse is thin.

Kidney deficiency:

Less menstrual flow, soreness of waist and knees, heel pain, dizziness, tinnitus and frequent urination. Pale tongue and weak pulse.

Blood stasis:

There is a small blood clot after less purple, abdominal pain, and the pain is relieved after the blood clot is discharged. The tongue is purple and dark and the pulse is astringent.

Phlegm dampness:

Less menstrual flow, red color, sticky as phlegm, obesity, chest tightness, nausea and sticky. The tongue is fat, the coating is white and greasy, and the pulse is slippery.

I can't see why you have too little menstruation. I can only say, go to the hospital for examination before treatment, and treat as soon as possible, otherwise it will affect fertility.