Breast cancer can lead to shortness of breath. This can occur due to the size and positioning of the tumor inside the breast or along the chest wall. If cancer has spread to the lungs, as can happen in the late stages of breast cancer, shortness of breath might be accompanied by a wheezing or a dry, hacking cough. Breathing difficulty usually suggests a lung or heart disease, but when coupled with one or more of the other early warning signs, it may also indicate advanced breast cancer.

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