When catching a cold, the body's immune system will be suppressed to a certain extent, which may reduce the body's adaptability to the altitude environment and increase the risk of altitude sickness. Therefore, I suggest you consult a doctor before going to the plateau area to confirm whether your physical condition is suitable for traveling.

If your cold symptoms are mild, you can take some measures to reduce the risk of altitude sickness, such as:

1. Slowly adapt to the plateau environment and gradually raise the altitude to avoid strenuous exercise and overwork;

2. Drink plenty of water to keep your body hydrated;

3. Eat lightly and avoid excessive drinking, smoking and other irritating behaviors;

4. Pay attention to keep warm to avoid the aggravation of cold.

If your cold symptoms are serious, it is recommended to postpone your plan to go to the plateau until your physical condition is stable. Before going to the plateau area, it is best to consult a doctor in advance and make preparations and prevention according to the doctor's advice. If necessary, you can carry some commonly used drugs for treating colds and relieving altitude sickness, such as antipyretic and analgesic drugs, antiallergic drugs and drugs for preventing altitude sickness.