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Sunstroke is a life threatening condition caused by overexposure to extreme heat. Also sometimes called heatstroke, this condition occurs when the bodyâs heat control system fails and it cannot lose the excessive heat. High temperatures can cause the bodyâs major organs to fail.unstroke is a life threatening condition caused by overexposure to extreme heat. Also sometimes called heatstroke, this condition occurs when the bodyâs heat control system fails and it cannot lose the excessive heat. High temperatures can cause the bodyâs major organs to fail.
For other uses, see Sunspot (disambiguation). Sunspots are temporary phenomena on the photosphere of the Sun that appear as dark spots compared with surrounding regions. They are areas of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarity.