"Não ande atrás de mim, talvez eu não saiba liderar. Não ande na minha frente, talvez eu não queira seguí-lo. Ande ao meu lado, para podermos caminhar juntos."

Tensão pré-menstrual pode ser coisa de mulher, mas é um problema que acaba afetando a todos -porque sempre sobra para quem está por perto, homem ou mulher, menino ou menina. Nem todas as mulheres ficam com o humor irritável no período pré-menstrual -ainda bem!- a ponto de se caracterizar um distúrbio que precise de ajuda médica.
A princípio, contudo, todas as mulheres estão sujeitas a essa variação do humor, mesmo que em pequeno grau, por uma razão simples: ela resulta dos efeitos sobre o cérebro da variação do hormônio progesterona que leva à menstruação.
A progesterona se acumula no sangue a cada ciclo menstrual a partir da ovulação, produzida pelo corpo lúteo que acompanha o óvulo.
Nos dias que precedem a menstruação, é esse hormônio que faz o revestimento interno do útero se espessar, em preparação para a implantação de um embrião.
Suas funções, no entanto, não acabam aí.

Chegando ao cérebro, a progesterona age como um poderoso ansiolítico natural para as mulheres: ela aumenta a capacidade de o cérebro regular a ansiedade e a resposta ao estresse de modo geral. No período pré-menstrual, quando o corpo lúteo degenera e o nível de progesterona no sangue cai drasticamente, esse efeito ansiolítico natural é perdido, e o cérebro fica mais susceptível ao estresse, à ansiedade e à depressão.
Nem todas as mulheres são afetadas do mesmo jeito. A ausência mensal do hormônio ansiolítico natural ao corpo é mais drástica em algumas mulheres que possuem, provavelmente por razões genéticas, uma quantidade menor dos receptores no cérebro que respondem à progesterona. Para elas, qualquer queda do hormônio leva à perda significativa do efeito ansiolítico natural e, como resultado, essas mulheres ficam especialmente irritáveis no período pré-menstrual, capazes de reagir à menor ameaça com uma intensa resposta de estresse e de responder agressivamente até a gestos e a comentários inócuos.
A irritação de fundo hormonal, no entanto, não é uma “licença para matar”. Mesmo que a perda temporária da progesterona ansiolítica explique a agressividade, ela não justifica nenhum tipo de comportamento grosseiro. A razão é simples: todos nós somos capazes de usar os serviços do córtex pré-frontal para dominar nossos impulsos. O primeiro passo para dominá-los é tomar consciência deles. Os hormônios têm voz, sim, mas o cérebro fala mais alto. 


Comentários em: "TPM explica, mas não justifica" (24)

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