Here is the classical explanation for a phenomenon everybody notices and nobody explains: why so many people fall ill in the first genuinely warm week of the year, rather than in the depths of winter.
Ayurveda's answer is that the sun's heat liquefies accumulated Kapha. Through Shishira it sat in the chest and stomach, cold and dense and inert. Spring warms it, it melts, and it moves — into the sinuses, the throat, the chest, the joints. The texts describe it with the image of snow: winter builds it, the first sun releases it, and what comes down the mountain is not gentle.
Which reframes the spring cold entirely. It is not something you caught. It is something you stored.
The regimen follows. Everything in the Vasanta prescription is aimed at helping the melt drain rather than settle: pungent, bitter and astringent tastes; lighter, drier, warmer food; vigorous exercise; dry massage; early rising; and — for those who work with a practitioner — vamana, therapeutic emesis, which the classical texts schedule specifically for this season and no other.
Meanwhile your digestive fire is falling from its winter peak. So the same fortnight asks for less food and more movement at exactly the moment the weather makes both feel unnecessary.
Remember this is a seam. Take the spring regimen up across two weeks, not two days.