When must you call your manager about your health?

You should call your manager about your health if you are experiencing a serious illness or injury that prevents you from performing your job duties, especially if it could impact your attendance. Additionally, inform them if you have a contagious condition that may pose a risk to others in the workplace. It's also important to communicate any health issues that may require accommodations or adjustments to your work schedule. Always err on the side of transparency, especially if your health situation could affect team dynamics or project timelines.