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小兒便秘的原因 導(dǎo)致小兒便秘的常見原因

出處：媽媽育兒網(wǎng)日期：2010-10-15 13:24:47編輯：admin

寶寶便秘了怎么辦？小兒便秘的原因有哪些你知道嗎？便秘是指腸子運動緩慢，水分吸收過多，導(dǎo)致大便干燥堅硬，次數(shù)減少，排出困難。由于嬰兒膳食種類較局限，常吃的食物中纖維素少而蛋白質(zhì)成分較高，因此很容易發(fā)生便秘，嬰兒便秘時，主要表現(xiàn)為每次排便時啼哭不休，甚至發(fā)生肛裂。肛裂的發(fā)生使嬰兒對大便產(chǎn)生恐懼心理，造成惡性循環(huán)，時間久了，可引起腹脹、食欲減退和睡眠不寧等癥狀。因此，嬰兒便秘應(yīng)及時解除。由于嬰兒的胃腸道神經(jīng)調(diào)節(jié)不健全，胃腸功能發(fā)育不完善，若用藥物通便，容易導(dǎo)致胃腸功能紊亂，發(fā)生腹瀉等。所以，對嬰兒便秘，食物療法是最理想的。

引起便秘的原因

原發(fā)性因素

1.飲食因素。

一些人飲食過少，食品過精過細(xì)，食物中的纖維素和水份不足，對腸道不能形成一定量的刺激，腸蠕動緩慢，不能及時將食物殘渣推向直腸，在腸內(nèi)停留時間延長，水份過多吸收而使糞便干燥。進(jìn)入直腸后的糞便殘渣因為量少，不能形成足夠的壓力去刺激神經(jīng)感受細(xì)胞產(chǎn)生排便反射而引起便秘。

2.排便動力不足。

排便時不僅需要肛門括約肌的舒張、提肛肌向上向外牽拉，而且還需要膈肌下降、腹肌收縮、屏氣用力來推動糞便排出。年老體弱、久病臥床、產(chǎn)后等，可因膈肌、腹肌、肛門括約肌收縮力減弱，腹壓降低而使排便動力不足，使糞便排不干凈，糞塊殘留，發(fā)生便秘。所以老年人多出現(xiàn)便秘。

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