There are many reasons for the slow growth of follicles, mainly including endocrine factors, ovarian factors, hypothalamic factors, adrenal gland factors, and lifestyle factors. 1. Endocrine factors: endocrine disorders may cause ovulation disorders, thus affecting follicle development and slowing its growth. 2. Ovarian factors: if there is ovarian disease, damage or aging, it may affect the normal development of follicles. 3. Hypothalamic factors: the normal ovulation process is affected by the hypothalamus, pituitary gland and ovarian axis, if the hypothalamus is abnormal, the balance of the three is broken, which will easily affect the follicle development. 4. Adrenal factors: If there is Cushing’s syndrome and other adrenal function abnormalities, it may cause slow follicular development. 5. Lifestyle factors: Some bad lifestyle habits, such as smoking and alcoholism, may stimulate the ovaries, affect their function and cause premature ovarian failure, thus leading to slow follicular development. If slow follicular development occurs, you should go to the hospital in time to get a clear diagnosis and carry out the treatment as soon as possible to prevent the symptoms from aggravating and causing other physical problems.