To quote from the article: "Feline lower urinary tract disease, or FLUTD, is the term that describes the following group of clinical signs: Bloody urine. Straining to urinate (can easily be mistaken for straining to defecate).
Cats commonly suffer from problems with their urinary system. Feline lower urinary tract disease (FLUTD) is a term used to describe a combination of signs, such as passing urine more frequently, blood-tinged urine or urinating outside the litter tray or with pain.
Expert Guide to Feline Lower Urinary Tract Disease: Symptoms, Causes, & Care. FLUTD & UTI in Cats: Causes, Symptoms & Care. Effective Natural Remedies for Cat Urinary Tract Infections.

Recovery and Management of Feline Lower Urinary Tract Disease (FLUTD). The recovery period for FLUTD varies with the treatment plan. If surgery is needed, a lengthier recovery time will be required for rest and healing.
Idiopathic feline lower urinary tract disease. In young to middle-aged cats presenting with signs of FLUTD, idiopathic disease is the most likely differential. Studies have highlighted several predisposing factors for this condition.

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Felines with lower urinary tract disease often show noticeable behavioral changes. Watch for these signs in your felineThe symptoms of feline lower urinary tract disease can vary, but they often include: Blood in the urine, which may appear pink or red. Difficulty or pain when urinating.