Upper UTIs are infections of the kidneys. These are potentially life threatening, if bacteria move from the infected kidney into the blood. This condition is called sepsis. Sepsis can cause dangerously low blood pressures, shock, and death.
So whe you hold your breath, you stop getting oxygen in your lungs that go to your heart. The oxygen level in the blood drops, so your muscles need more oxygen, so the heart pumps faster. This is like running, your muscles need more oxygen so heart pumps faster
Your breathing and your heart pumping blood effectively are very closely related. Your heart pumps blood so it can circulate to your tissues as well as get oxygen from your lungs. If your heart canât pump blood well (as is the case with a heart attack), you can feel short of breath. Shortness of breath can sometimes be an accompanying symptom to unusual fatigue in women. For example, some women report they would get unusually short of breath and tired for the activity they were performing.