Answer:
People should avoid others until their symptoms clear, as it is very contagious when caused by an infection. Most people are safe to go back to work, school, or daycare once symptoms have cleared. Treatment is often only required in severe cases, or when the infection does not clear on its own.
Answer:
Headaches can have causes that aren't due to underlying disease, examples include lack of sleep, an incorrect eyeglass prescription, stress, loud noise exposure, or tight headwear (:
Sunburn is caused by too much exposure to ultraviolet (UV) light. UV light may be from sunlight or artificial sources, such as sunlamps and tanning beds. Melanin is the dark pigment in the skin's outer layer that gives skin its normal color
Hope I helped