痰中帶血..

The correct medical terminology to describe blood in sputum is ---- Hemoptysis.

In your case, the most likely cause (most likely only, not the definite) is 感冒(URTI), because repeated coughing will cause injury to the upper airways.

Other possible cause of Hemoptysis beside URTI is as follows:
(The list is not exhaustive)

1. Lung Cancer
2. Pulmonary Tuberculosis
3. Bronchiectasis
4. Pulmonary endometriosis
5. Pneumonia
6. Trauma

If the problem is recurrent. You should seek Medical Attention IMMEDIATELY.

see doctor~~~~~~~~~~~``

有病梗係醫生啦！

正常就應該係

但最好就睇多一次，唔知係咪d葯唔啱你食

拿d葯再去睇醫生啦