Common cold is different from a flu: you will get a lot of nasal secretions in a cold but you won't feel that sick. In contrast in a flu you would get muscle aches and fever, and feel a lot more sick.
傷風同感冒唔同，通常傷風個人會多啲鼻水，但係個人唔會真係好病。而感冒先會有肌肉痛、發燒嘅症狀，個人會殘好多㗎。