Throat pain and phlegm are likely to be caused by inflammation, such as bacterial infection. You need to go to the hospital to check, identify the cause, and treat symptomatically. If it is caused by bacterial infection, you can take some anti-inflammatory and anti infective drugs to treat symptomatically. Most of them are respiratory tract infections. It is suggested that you can use honeysuckle or Panghai Sea to drink water every day, which has the effect of clearing heat, removing fire and detoxifying. For patients with severe throat pain and excessive sputum, they can take some cough relieving and expectorant drugs, such as Compound Licorice Oral Liquid, Nianzi'an Syrup, and some cephalosporin anti-inflammatory drugs, or azithromycin, amoxicillin, and other anti-inflammatory and anti infective drugs for treatment. Therefore, for sore throat with phlegm, it is necessary to identify the cause and actively give symptomatic treatment. Pay attention to light diet, drink more warm water, eat more fresh vegetables and fruits, and improve the immunity of the body.