In Ayurveda, both vata and kapha dosha cause colds and flu when they are out of balance and immunity is weak. Excess kapha dosha has the qualities of cool, heavy, and moist which causes runny nose, sneezing and a cough with a lot of phlegm. Excess vata dosha has the qualities of dryness, lightness and moving fast which causes coldness with chills and a dry cough.
Kapha’s qualities are damp, cold, heavy, sticky, jelly-like, blocking and stable. These qualities can naturally accumulate over the winter but are readily felt during the Spring. During the winter kapha is in it's solid state (frozen) and as the weather starts to warm up during the spring it starts to melt (liquid) and then kapha begins to flow and move from its solid-state.