Thickening of the left adrenal gland in women is a kind of imaging test, which may be related to left adrenal hyperplasia, left adrenal adenoma, etc. Surgical treatment is needed according to different causes, etc. Consultation with a doctor is recommended. 1. Left adrenal hyperplasia: due to the long-term application of adrenocorticotropic hormone drugs, women’s left adrenal gland hyperplasia occurs, resulting in the thickening of women’s left adrenal gland. 2. Left adrenal adenoma: this disease is mainly benign adenoma, which will lead to thickening of the left adrenal gland of women. Adrenal adenoma needs to be treated according to whether the adenoma is functional or not, and the non-functional adenoma can be treated conservatively with regular observation, while the functional adenoma needs to be treated with surgery if necessary. It is recommended that patients should go to the hospital in time for a complete examination when uncomfortable symptoms occur, and then follow the doctor’s instructions to carry out scientific and effective treatment after the cause of the disease has been clarified.