When adrenaline is released, it signals the brain to redirect energy and blood from the internal organs to the muscles to prepare to fight or flee. Adrenaline causes an increased heart rate, high blood pressure and rapid, shallow respiration. The body temperature will increase and cause sweating. Thus the release of adrenaline starts perspiration.
A blocked nose is a common symptom associated with viral infections such as the common cold or the flu. They occur as a result of our mucous membranes becoming inflamed.
If we are suffering from a cold and our nose is running constantly, the mucous membranes will become swollen and inflamed leading to a blocked nose or nasal congestion.
Blocked nose affects olfactory receptors. Each olfactory neuron has one odor receptor. If the channel is blocked, such as when our nose is stuffed up by a cold or flu, odors can't reach the sensory cells that are stimulated by smells. As a result, we lose much of our ability to enjoy a food's flavor.