Do you stare at a computer screen all day long at work?

Constant use of the eyes by staring or excessive reading is known to injure Liver Blood, according to TCM theory.  The eyes are associated with the Liver, as are the tendons, nails and the emotion of anger or frustration.  The symptoms you may feel could therefore include stiffness of the joints, nails that tend to be thin and break easily, moodiness, irritability, light menses, dizziness, inability to concentrate, vision problems, skin conditions, itchiness, numbness, and tingling. 

According to TCM Five Element theory:

• Sitting for too long can injure the muscles. 
• Standing for too long will injure the bones. 
• Lying down for too long will drain the Qi.
• Walking too much injures the tendons.
• And as described above, staring for too long will injure the Blood.