Acute renal colic refers to the sudden and intense pain experienced in the flank or side of the body. Typically, this pain originates in the lower back and can radiate towards the abdomen or groin area. The primary culprit behind renal colic is often a kidney stone that becomes lodged while making its way through the ureter. The ureter is a narrow tube responsible for transporting urine from the kidney to the bladder.
The severity of the pain is not necessarily linked to the size of the stone or the extent of the blockage. Interestingly, smaller stones tend to be more manageable as they have a higher likelihood of passing naturally.
Mechanisms behind Kidney Stone Obstruction
When it comes to renal colic caused by kidney stones, there are three primary mechanisms at play. The first and most frequently observed is when a stone becomes lodged in the ureter, leading to a buildup of pressure in the mucosa or lining of the ureter. Another way kidney stones can trigger renal colic is by irritating the lining of the ureter. Lastly, stones can also contribute to renal colic by causing stretching and edema, ultimately obstructing the normal flow of urine.
Signs of Renal Colic
Renal colic is typically characterized by the presence of pain, which is the most common symptom associated with this condition. Unlike other types of pain, renal colic pain is sudden and does not respond to position changes or over-the-counter pain medication. It tends to occur at night or early in the morning, often causing the person to wake up from sleep. Although less common, symptoms can also manifest during the day, but in these cases, the pain typically develops gradually, often following strenuous physical activity.
Approximately one-third of patients with renal colic experience severe pain within 30 minutes of noticing the initial symptoms. The duration of the pain can vary, lasting anywhere from four to 12 hours. The sensation may be described as dull and continuous, occasionally accompanied by periods of heightened intensity.