My periods doesn't take place after 28 days but 25...

The normal range of menstrual cycle is about 28 days and can be from 21 to 35 days and it's normal and there is no problem to be worried about .

Treatment of menstrual disturbance :

The treatment is being decided according to the cause of your symptoms after doing investigations and medical examination and determining the cause and then the diagnosis and treatment are decided by the doctor .
In case of polycystic ovarian syndrome the treatment includes hormonal therapy like combined oral contraceptive pills and weight reduction .
In addition to the importance to avoid stress and psychological problems and exhaustion .

Diagnosis of menstrual disturbance :

The diagnosis is made by taking full history and clinical examination of the patient and doing investigations including blood investigations like CBC, thyroid functions, ovarian functions, estrogen and progesterone and testosterone hormones levels  and doing pelvic and abdominal ultrasound .

Causes of menstrual disturbance :

- Thyroid disorder

- Polycystic ovarian syndrome

- exhaustion

- stress

- severe weight loss

- obesity

- hormonal disturbance

Advice :

See the obstetrician and gynecologist .