The most common symptom is headaches.

最普遍的征兆是头痛。

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The most common symptom is feeling tired because the body is not receiving enough oxygen.

最常见的症状是缺氧而造成的疲乏。

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But research suggests that all such vascular conditions are linked by one common symptom - high blood viscosity.

但是调查显示，所有的血管疾病都与一个普遍的症状有关，即高血粘度。

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Seemingly untouched by Hollywood, they did not project the jadedness that is a common symptom of stardom.

NEWYORKER: Beyond the Matrix

Some conventional weapons or legal crowd control can also release smoke that causes respiratory problems, a common symptom of chemical weapons exposure.

CNN: Israeli official: Syria using chemical weapons

If you have acute pericarditis, the most common symptom is sharp, stabbing chest pain behind the breastbone or in the left side of your chest.

CNN: Pericarditis