The recent rise in long-term U.S. Treasury yields isn't a cause for concern but the debt situation is becoming increasingly unsustainable, DNB Asset Management's Ingvild Borgen said in a note. DNB attributes the rise in yields to a combination of strong economic growth, sharp increase in the supply

The anomalous recent behavior of the 10-year yield is actually as sign that "demand for Treasury debt is weaker than first meets the eye."

U.S. Treasury yields are hitting new highs for the year on fears about inflation and excessive debt. Rising yields create opportunities—along with serious portfolio risks.