The root of the penis is soft, and the possible clinical causes are internal diseases, damage to the penis itself, the influence of mental factors, erectile dysfunction and so on. 1. Internal medicine disease: clinically common such diseases are hypertension, diabetes mellitus, coronary heart disease, etc., penile blood vessels and blood flow will be affected. 2. Penile injury: clinically, this kind of situation is common, such as damage to the white membrane of the penis, which will lead to the inability of the penis to retain the blood flow into the corpus cavernosum, and thus have difficulty in erection. 3. Mental factors: Psychological anxiety, recent lack of sleep, mental stress, etc., will cause the erectile state of the penis to be affected, resulting in erectile abnormality. 4. Erectile dysfunction: softness at the base of the penis may also be a sign of erectile dysfunction. For these cases, it is best to go to a reputable public hospital to do a systematic analysis and examination, only then can targeted treatment.