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Though it's worth noting that if you don't drink enough water, that dehydration can become dangerous.
但值得注意的是，如果飲水不足可能變成危險的脫水。
Even the body's aches make you more sensitive,
連身體疼痛也會使你變得更敏感，
drawing attention to infected cuts that might be worsening, or even causing your condition.
讓你注意到有個感染的傷口可能加重，或造成了你目前的狀況。
In addition to physical symptoms, sickness can also make you irritable, sad, and confused.
除了身體癥狀外，生病也會令你感到煩躁、憂傷以及思想混亂。
That's because cytokines and prostaglandin can reach even higher structures in your brain,
那是因為細胞因子和前列腺素能到達腦部更高層的組織，
disrupting the activity of neurotransmitters, like glutamate, endorphins, serotonin, and dopamine.
干擾神經傳導物質的運作，例如：谷氨酸 (glutamate)、內啡肽 (endorphin)、血清素 (serotonin)及多巴胺 (dopamine)。
This affects areas like the limbic system, which oversees emotions, and your cerebral cortex, which is involved in reasoning.
這會影響一些區域，如監督情緒的邊緣系統（Limbic System）及參與推理的大腦皮質。
So it's actually the body's own immune response that causes much of the discomfort you feel every time you get ill.
所以事實上是身體自己的免疫系統導致每次感冒時的諸多不舒服。
Unfortunately, it doesn't always work perfectly.
不幸的是，免疫系統并不總是運作完美。
Most notably, millions of people worldwide suffer from autoimmune diseases,
最值得一提的是，全球有數百萬人罹患自體免疫性疾病，
in which the immune system treats normal bodily cues as threats, so the body attacks itself.
也就是免疫系統將正常身體信號視為威脅，因而攻擊自己的身體。
But for the majority of the human race,
但對大部份的人類而言，
millions of years of evolution have fine-tuned the immune system so that it works for, rather than against us.
數百萬年來的演化已將免疫系統精細調整以便為人類效力，而非對抗。
The symptoms of our illnesses are annoying, but collectively, they signify an ancient process
生病的癥狀雖很惱人，但總體而論，它們象征著一種久遠的過程，
that will continue barricading our bodies against the outside world for centuries to come.
在未來的世紀將繼續保衛我們的身體，對抗外在的世界。
