You may also be flagging（疲乏） due to low levels of the hormone thyroxine（甲状腺素）.
This chemical affects the entire body's metabolism（新陈代谢） and a lack of it slows down your brain.
About 2 percent of the UK population are thought to have the condition, which is most commonly caused by the immune（免疫） system attacking the thyroid gland（甲状腺）.
甲状腺机能减退
由于甲状腺素水平较低，您也可能出现症状。
这种化学物质会影响整个身体的新陈代谢，缺乏它会减慢大脑的速度。
大约2%的英国人口被认为患有这种疾病，最常见的原因是免疫系统攻击甲状腺。
'The thing with hormones is they have a massive effect on all your body's cells and tissues. They are the chemical messengers and they tell your body how it is doing, and what it should do,' said Dr Hassain.
'When you don't have enough thyroxine it will slow down your brain, lower your mood, because it regulates your emotional processing,' he added.
Doctors can test you for hypothyroidism by taking blood samples.
It is mostly treated using daily hormone tablets, but if left untreated it can lead to heart disease, pregnancy problems and swelling in your neck as well as fatigue.
激素的问题是它们对你身体的所有细胞和组织都有巨大的影响。哈桑博士说：“它们是化学信使，它们告诉你的身体它在做什么，它应该做什么。”。
“当你没有足够的甲状腺素时，它会减慢你的大脑，降低你的情绪，因为它调节你的情绪处理，”他补充道。
医生可以通过采集血液样本来检测你是否患有甲状腺机能减退症。
通常使用每日激素片治疗，但如果不治疗，可能会导致心脏病、妊娠问题、颈部肿胀以及疲劳。
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