My cat strains to pee, shakes, and has a hard lump. Is it serious?

Oh no, that's not good. This can be a sign of a blockage in the urethra from bladder stones. A urethral blockage is fatal without treatment, and since I can't see Mittens in person to rule one out, I think it's best to take him into a vet now. Please take him into an ER vet clinic; if there isn't one in your area, there will be a vet on call for emergencies. The information to reach that vet is found on a clinic's answering machine or website.

This is an emergency. You need to take Tommy to a pet ER right away. He may have seizures and if he cannot pee he may have a urinary blockage. This would be life-threatening. Please take him to a pet ER now.

I would be concerned if your cat is straining that he may be obstructed. Urine will not be able to exit the body thusly and will result in your cat becoming very ill very quickly. This is a medical emergency and Dizzy should be seen immediately to be sure this isn't the case. If it is, they will need to intervene and relieve the obstruction. Best of luck.

If she is unable to pass any urine she needs to be seen immediately to prevent bladder rupture and may need a catheter to relieve the pressure and prevent nerve and muscle weakness. This is an emergency and should not be managed at home and causes severe pain and discomfort with potential life threatening complications

Poor Max! It's very concerning that he is crying when urinating, and I would check him to see if he is straining while urinating and if no urine is coming out. Crying when urinating can indicate a blockage by bladder stones, and the other symptoms seen are straining and producing no urine. A blockage is a medical emergency which is fatal without treatment, and if he straining and producing no urine, you have to get him into a vet right away. There will be a vet on call in your area for emergencies, and the information to reach that vet will be on their answering machine or website. I would find a vet on call to have him seen now, if he is blocked it absolutely cannot wait until the morning.

Poor Tickle! If she is unable to pee, this is a medical emergency. It could be she is suffering from a urinary tract obstruction. Typically this occurs most often in male cats, but it can happen in female cats and signs include an inability to pee, severe pain (which she showed by panting), and vomiting. She needs veterinary care, as if she does have a urinary blockage, it is fatal without treatment. Please take her into a vet immediately.

This could be crystals in his urine. It's quite concerning that Gilmore has these chunks in his urine, as these could potentially cause a blockage in his urethra. A urethral blockage is a medical emergency as it's fatal without treatment. I think it's best you take him into a vet immediately to get this diagnosed and treated. Best of luck.