Thoughts have been with Secretary of State Hillary Clinton over the last few days, after the nation learned of a blood clot in her head. Reports say the blood clot is the result of a recent concussion the Secretary suffered in December.

She is reportedly on blood thinners, although she did not suffer a stroke or neurological damage, according to the Associated Press and The Atlanta Journal-Constitution.

Below are a some common things to know about blood thinners and clotting by the Mayo Clinic and the Agency for Healthcare Research and Quality.

• Blood thinner medications must be taken exactly as directed. Too much or too little can be detrimental. Doctors often monitor how the blood thinner is working on a weekly basis to adjust the dosage.

• According to Mayo Clinic cardiologist Martha Grogan, despite blood thinners, an underlying disease, such as cancer, may cause clotting.

• Certain foods, alcohol and other medications taken with blood thinners can decrease its effectiveness.

• Sometimes leafy green vegetables can interact with blood thinners.

• Be mindful of activities while on blood thinners. Fall or minor cuts can cause excessive bleeding.

•  Taking aspirin while on blood thinners can be harmful. Check with your doctor first. 

•  It's important to take blood thinner medication at regular times as directed by your doctor.