How long it takes for phlebitis to heal itself is related to the cause of the phlebitis, the location of the phlebitis, and so on, and it needs to be analyzed on a case-by-case basis, so it is not possible to make a generalization. Infusion phlebitis caused by high drug concentration, infusion drip speed and other stimulation of blood vessels, if the degree of mild, usually 3-5 days can be self-healing, but if the symptoms are obvious, such as redness, swelling, warmth, pain, pigmentation, or even ulcers along the superficial veins of the skin, self-recovery is difficult, and need to be interfered with medication or surgical treatment. Then thrombophlebitis, if it is caused by venous thrombosis, it needs to be treated in time, and it is not recommended to wait for it to heal by itself because there are risks such as dislodging of embolus, which is dangerous and needs to be taken seriously. If phlebitis of the lower limbs is in the acute stage, it needs to be braked, avoiding massage, extrusion, etc. After the symptoms of phlebitis are gradually reduced and stabilized, you can do appropriate exercises, such as hooking the toes, tiptoeing, etc.