1 blood loss (caused by ulcers, some cancers, and other conditions; and, in women, during monthly periods); 2  a diet that doesn't have enough iron in it; 3  taking medications that interfere with the ability of the body to absorb iron; 4  an increase in the body's need for iron (for instance, in women during pregnancy). blood loss (caused by ulcers, some cancers, and other conditions; and, in women, during monthly periods); 2  a diet that doesn't have enough iron in it; 3  taking medications that interfere with the ability of the body to absorb iron; 4  an increase in the body's need for iron (for instance, in women during pregnancy).
I can tell you that your Celtic knot is a quaternary design - meaning it has four distinct sections within the design. Quaternary celtic knot meanings are upon the era, region, and artist of the design's inception (yes, more variables). Here are a few meaning possibilites of your Quaternary knot design... Indication of the four directions: North, South, East, West.
Pure knot designs appear to have no beginning or end, symbolizing the repeated crossing of the spiritual and physical planes. Each knot pattern has a specific meaning. Other Celtic tattoo designs include animals, dragons, family crests, the tree of life, or other images. In these types of Celtic tattoo designs, the knot pattern may be ornamental to frame the illustration.