I am coughing up some blood in my mucus, but no fever. Can it be serious?

Could be. There are many reasons for coughing up blood some of which are serious. It is important to have this problem evaluated by your primary care physician.
Yes... Coughing up blood, called hemoptysis, is usually due to bronchitis. However, it can also be due to malignancy. So, you need to see your doctor to rule out malignancy and treat the underlying disorder. If you are smoking, your doctor can help you to quit.

Related Questions

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Burning when I cough started out as sore throat two days ago then stuffy nose with yellow green mucus now coughing up same mucus no fever?

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