Bitterness in the mouth after a cold is mostly due to the accumulation of internal heat in the lungs and stomach before the evil is gone. Shuanghuanglian Oral Liquid can be taken orally to relieve the symptoms of bitterness in the mouth, as it is effective in clearing heat and toxins. You can also take Pu Di Lan Anti-inflammatory Oral Liquid, which has the effect of clearing heat and detoxifying, anti-inflammatory and anti-swelling. Usually, you can use honeysuckle, dandelion, xuan ginseng, maidenhair and orris, taken in water, as a tea substitute, with the effect of clearing heat, detoxifying and nourishing yin. If you have cough symptoms, you can use Chuan Bai Mu 5 grams, 1 pear, 10 grams of Chen Pi and 10 grams of Lily, taken in water and drink as a substitute for tea, which has the effect of clearing heat, moistening the lung and benefiting the throat. It can also be treated by Chinese herbal soup, usually given with Yin Qiao San plus reduction, which has the effect of cooling and relieving the symptoms. If the cold is not cured, continue to take oral anti-cold medications, such as cold spirit granules, which can treat and relieve various symptoms caused by common cold and influenza.