猛起头晕，可能因为以下几点：

有一些身体现象合情合理。比如说冰淇淋头痛，你知道是因为什么原因，你也知道是自己活该，而且对此你还完全无怨无悔。而其他的一些现象则有些神秘了，好比你猛地站起来会头晕眼花眼冒金星。

The good news is, a sudden bout of lightheadedness from jumping out of your seat probably isn't a big deal. But there are certain signs you should look out for that might indicate a more serious issue. Here are some common causes of that familiar head-spinning sensation:

好消息是，从座位上跳起来时产生的突发的一阵头晕可能不是什么大毛病。但是你得注意有一些迹象可能代表着更严重的问题。以下就是一些在猛起时引发头晕的原因：

1. You've been working out.

1. 你有在锻炼。

You may know that athletes have lower resting heart rates; that's because in general, exercise makes your heart stronger, allowing it to pump out more blood in less beats. This is usually a great thing because it means your heart is strong, but the slow pace can also be a common cause of dizziness when you go from intense cardio action to your post-workout rest phase. Consider a longer cool-down to ease the transition.

你应该知道运动员有着很慢的心跳次数，这是因为总的来说，锻炼会让你的心脏更强壮，让少次的心跳也能泵出更多的血液。通常这是一件好事儿，因为这意味着你的心脏更强大了，但是当你结束激烈的有氧活动过进入到锻炼后的休息阶段时，缓慢的心率也是引起眩晕的一个常见原因。可以把它当做是缓和过渡时需要较长的冷却时间。

2. You're not eating enough.

2. 你没吃饱。

If you've been subsisting on juice or other non-chewable sustenance...quit it. Low blood sugar is one surefire way to get dizzy (and just generally feel like utter garbage), so stop skipping meals, and make sure you eat a healthy meal or snack every few hours.

如果你还在靠喝果汁和其他不需要咀嚼的食物当饭的话，赶紧停下。低血糖肯定会导致头晕(而且通常会感觉像是个彻底的废物)，所以别不吃饭，而且确保每隔几个小时就要吃一顿健康的饭或者零食。

3. Your blood pressure is too low.

3. 你的血压太低。

Whether you realize it or not, in the split second it takes to stand up, blood from your brain travels down toward your feet, all thanks to a little thing called gravity. That blood doesn't get pumped back up to your noggin until the next heartbeat, so if your pulse is extra slow for any reason (the aforementioned athleticism, age, medication and other things can all play a role), you might routinely feel woozy when you get up. Try moving slower when you transition from seated to standing and see if that helps.

无论你是否意识到，在你起身的一刹那，血液会从脑部涌向脚部，这都要归功于一个叫“重力”的小家伙。在下一次心跳之前，血液是不会被泵回到脑部的，所以如果因为任何原因(前文提到的锻炼、年龄、药物和其他因素都可能是原因)导致你的脉搏跳的超级慢，你会经常在站起来的时候感到头晕。试着从坐姿变为站姿时动作慢一些，或许有效果。

4. You're too thirsty.

4. 你太缺水了。

Another major reason you might feel lightheaded when you stand has to do with your hydration levels. If you're not taking in enough water, your blood flow may slow down and take your blood pressure down with it. Check your urine: If it's tinged with a dark yellow, pink or orange tone, it's time to stop what you're doing and drink some H20.

另外一个在你站起来时会感到头晕的主要原因是水合作用的水平。如果你没有摄取足够的水分，你的血液流速会放缓并且也会使你的血压随之降低。检查自己的尿液：如果尿液带有深黄色、粉色或者橘黄色的颜色，那就是时候停下手中的所有事情赶紧补充水分了。

5. You're overheating.

5. 你身体过热了。

High temperatures or too-intense workouts can also cause dizziness by causing you to lose fluid through excessive sweating. Heat stroke can be serious, so if you suspect you're overheating, immediately get to a cooler setting and consider seeking medical attention.

高温或者是过于激烈的锻炼也会使你过度的流汗损失体液而引起头晕。中暑会很严重，所以如果你怀疑自己身体过热了，立即去一个凉快一些的地方，然后寻求医疗帮助。

6. You have problems with your inner ear.

6. 你的内耳有问题。

There's a difference between a slight sense of dizziness and a major case of the spins. If you feel like the room is spinning even once you've stayed stationary for a moment, you might have an inner ear issue called vertigo. This can also be a big deal, so contact a doctor right away if you suspect this is what you're experiencing.

轻微的头晕和严重的眩晕是有区别的。如果即使在你静止不动一段时间以后还会觉得整个屋子都在旋转，那么你的内耳可能有一种名叫耳源性眩晕的问题。这也能是一个大问题，所以如果你怀疑自己患上了这种病症，就赶紧去看一下医生吧。

The bottom line is that the occasional bout of dizziness is probably nothing to worry about, but if you're experiencing something more severe than a slight sensation or you're feeling lightheaded when you're just sitting, make an appointment with a doctor ASAP so they can assess any serious medical problems.

底限是偶尔的一阵头晕可能没什么好担心的，但是如果你感觉比轻微头晕还要严重的多或者就算坐着时也会有头晕，尽快去医院让医生来诊断你是否有什么严重的病症。