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.
In Celtic Art, Celtic knots (also known as 'endless knots' or 'mystic knots') are series of overlappying or interwoven knots which have no clear start or end. They started to appear in Celtic Art in the second half of the 5th Century whereas Celtic spirals appeared much earlier, as early as 600 BC.