After recovering from the second bout of yang, there have been persistent symptoms of a cold.

　　"Second infection" generally refers to a second bout of infection with the novel coronavirus. In most cases, persistent cold-like symptoms after recovering from a second COVID-19 infection may be related to malnutrition, chronic fatigue and stress, weakened immune system, medication side effects, or reinfection, among other causes. Targeted treatments are recommended. It is advised to seek timely medical evaluation and treatment at a hospital. Specific details are as follows:

　　1. Malnutrition

　　During a second infection with the novel coronavirus, malnutrition in patients may lead to reduced immune function, making the body more susceptible to infections. Deficiencies in vitamins and minerals can impair the growth and function of immune cells, reducing the body's resistance to pathogens and increasing the likelihood of catching a cold. It is advisable to consume nutrient-rich foods regularly, such as fresh vegetables and fruits.

　　2. Chronic Fatigue and Stress

　　Chronic fatigue and stress during recovery may weaken immune system function, making the body more prone to infections and thus increasing the risk of developing a cold. Moderate exercise can help strengthen immunity and reduce discomfort.

　　3. Weakened Immune System

　　During recovery from a second COVID-19 infection, the immune system may remain compromised, leaving the body more vulnerable to infections. Patients may feel weak and fatigued and become more susceptible to viral or bacterial infections, potentially leading to colds. Medications such as Yupingfeng Pills, Jinshuibao Capsules, or Bailing Capsules may be used under a doctor’s guidance.

　　4. Medication Side Effects

　　Certain medications used during treatment for a second COVID-19 infection may have immunosuppressive effects, increasing susceptibility to infections and causing cold-like symptoms such as nasal congestion, headache, and sore throat. Consult a doctor to determine whether medication should be discontinued or changed.

　　5. Reinfection

　　The aforementioned symptoms could also indicate a recurrent infection with the novel coronavirus, which presents similarly to a cold, including fever, headache, and sore throat. Follow medical advice to manage symptoms using medications such as Lianhua Qingwen Capsules, Antiviral Oral Liquid, or Oseltamivir Phosphate Capsules.

　　During recovery, patients should maintain a light diet and stay warm to support the healing process.