When a woman has pain in her underarm parastomia at the beginning of pregnancy and then slowly stops hurting, it is usually due to progesterone stimulation, which is a normal situation. When a woman is pregnant, the progesterone in her body will rise significantly, which will stimulate the breasts and cause temporary breast enlargement, and there will be localized swelling and pain. As the duration of pregnancy increases, the breasts will adapt to the hormones, and the symptoms of breast swelling and pain will gradually ease. Underarm breasts also belong to the breasts, and this symptom is usually normal. If a pregnant woman is experiencing discomfort in addition to the swelling and pain in her underarms that cannot be relieved on its own, it is recommended that she go to the hospital in a timely manner, and under the guidance of the doctor, take reasonable measures to intervene and promote the relief of discomfort as soon as possible.