Ora aí está uma dúvida que me persegue à anos e a resposta é : não, apanhar frio não constipa.

«Acute viral rhinopharyngitis, or acute coryza, usually known as the common cold, is a contagious, viral infectious disease of the upper respiratory system, primarily caused by picornaviruses (including rhinoviruses) or coronaviruses. It is the most common infectious disease in humans and there is no known cure….

An ancient myth still common today claims that a cold can be “caught” by prolonged exposure to cold weather such as rain or winter conditions, which is where the disease got its name…

…With respect to the causation of cold-like symptoms, researchers at the Common Cold Centre at Cardiff University conducted a study to “test the hypothesis that acute cooling of the feet causes the onset of common cold symptoms.he study measured the subjects’ self-reported cold symptoms, and belief they had a cold, but not whether an actual respiratory infection developed. It found that a significantly greater number of those subjects chilled developed cold symptoms 4 or 5 days after the chilling. It concludes that the onset of common cold symptoms can be caused by acute chilling of the feet. Some possible explanations were suggested for the symptoms, such as placebo, or constriction of blood vessels of the nasal passages which might lead to reduced immunity, however “further studies are needed to determine the relationship of symptom generation to any respiratory infection.”»

In Wikipedia

Adenda 12/12/2017: Vale a pena ler O Frio e a Constipação…o Mito que se Recusa a Morrer?