The reason why men have difficulty in getting an erection and can only get hard with their hands is most likely related to kidney deficiency in the body, in addition, it may also be due to mental and psychological factors. The intensity of sexual stimulation produced by using hands is stronger and it is easier to cause erection with hands. Men usually have a kidney deficiency, and may show no response or delayed response to certain sexual stimuli or sexual hints. At this time, it is recommended to go to the hospital for relevant examinations, and according to the doctor’s instructions in daily life to take some drugs to replenish the kidneys, and give up the habit of masturbation. If it is caused by mental and psychological factors, it is recommended to go to the hospital for psychological examination, and usually pay attention to regulating the mood, physical exercise and so on.