Runny Nose

A runny nose happens when your body produces too much mucus to clear out viruses, bacteria, or other particles in your nasal passageways. A runny nose is a common side effect of cold viruses as well as allergic reactions.

A runny nose can be a side effect of the following breast cancer treatments:

• chemotherapy
• Herceptin (chemical name: trastuzumab), a hormonal therapy

Managing a runny nose

If you have a fever, sinus pain or nasal discharge that's bloody or green- or yellow-colored, you may have a sinus infection. Ask your doctor about medicines you can take to treat the infection.

• Blow your nose gently -- don’t strain yourself.
• Use soft tissues when you blow so your nose doesn't get red and raw.
• Apply petroleum jelly to your nostrils to help prevent irritation.