Facial palsy can develop over a period of up to 2 weeks. Facial palsy, also known as facial neuritis, is primarily caused by nonspecific inflammation of the facial nerve and commonly occurs after exposure to viruses or bacteria. The acute phase of facial palsy is approximately 1-2 weeks, the subacute phase is 2-3 months, and the recovery phase is 3-36 months. About 80% of patients have relatively mild symptoms and heal relatively well, starting to recover in 2-3 weeks, with the acute phase lasting about 5-7 days. If the patient is sicker, the acute phase can reach 7 days and the disease is still progressing and worsening. The disease progresses and worsens, and facial nerve edema is considered to be more severe. Some patients will take 3-6 months to recover due to the more severe injury, and some patients may even develop complete paralysis and will be left with paralysis of the facial nerve. With recovery, facial muscle spasm can also occur.