A round object in the chest that moves may be a breast nodule, breast cyst or lipoma, etc. The exact cause of the condition will require a mammogram to confirm the diagnosis. If the hard mass moves significantly before the onset of menstruation, this condition may be a hyperplastic nodule of the breast. In addition, conditions such as breast fibroids, lipomas, and breast cysts may also cause a round object in the chest to move. Patients can obviously feel a foreign body in the chest with good mobility, which is mostly a benign lesion that needs to be closely observed and can basically be differentially diagnosed after ultrasonography and mammography. If tumor is suspected, patients need to undergo pathological puncture biopsy and observation of cell morphology, etc. After perfect examination, targeted treatment will be carried out. In this case, women should not worry too much and visit the breast surgery department in regular hospitals for examination and treatment. In general, you should pay attention to maintain a good mood, timely relief of stress, regular life, do not stay up late.