The best way to know for sure whether or not there's any lingering damage is to wait and see until after the illness heals. I do know that if you have upper respiratory infection for too long it can lead to other problems. I had one particular infection that gradually worsened into whooping cough, and I must, And I must now continue using an inhaler and even a nebulizer due to cough variant asthma that was caused by the prolonged infection. I'm not sure whether or not my asthma will be permanent, but I have heard that once you get asked by you usually never get rid of it, so I guess I'll just have to wait and see what happens. I will say that something strange happened a while back with a choking incident when a small piece of food went down my windpipe, hitting the exact spot that usually triggers coughing, yeah, that spot. There was about a day or two almost 3 that I didn't need my inhaler at all. At first I thought I was cured of my asthma, but what I discovered is the asthma is actually less than it was before the choking incident. Before the choking incident I was actually having to use my inhaler more and more because the asthma was seemingly worsening until after the very productive choking incident. I'm not as dependent on my inhalant as before. However, i'm not out of the woods yet. I know enough not to go too long without my inhaler medications. I think that having an upper respiratory infection of any kind for too long can actually cause future negative repercussions, because we were never even designed to have infections to start with. I'm not sure if pneumonia can cause permanent damage, but I know whooping cough caused me future negative repercussions in the form of cough variant asthma. When I had the infection that started small, it worsened over a period of about a year or so. I was trying to kick they infection on my own, but it got so bad to the point that I knew that if I didn't get help I wasn't going to have much time left and they infection would indeed kill me. In my case, I'm experiencing negative repercussions.
In your case, you'll definitely want to try changing your diet and adding more ice water or even warm water to your daily regimen, and I'll explain why:
I used to have an elderly friend who since died. He was always getting pneumonia and I could never figure out why until hindsight helped me see the big picture of self neglect. He was really not taking good care of himself. He didn't really have a very healthy diet and he rarely if ever drank any water because he said he hated water. He didn't want to hear that water was actually the very key to successfully heal from all illness and help him defend against future illness. He was also fighting a battle between diarrhea and constipation. I just wanted so bad to reach into his head and open his mind to seeing what he was doing to himself. Oh, if only I could've opened his eyes, because I had so other choice but to standby and watch what was happening. I can't describe how helpless and powerless I felt, wanting so bad to help him but I couldn't because he was too stubborn and bullheaded to the point he refused to change and now it cost him his life. He was in his 90s, but he could've clearly lived so much longer. I watched him go downhill until he had to finally be put into a nursing home after too many squad rides and ER visits. I'm sure they got sick of seeing him. I can't stress enough how important drinking enough water is.
Believe it or not, if you ever get a pain in the mid right side of your back about halfway through you, you most likely have a UTI. I had this going on for about a year, but the hospital missed it and dismissed it as muscular pain. I was given pain killers only for the problem to worsen by the next year. In fact, the pain worsened so bad I almost blacked out. I knew something just wasn't right, and I knew all along this could not have been muscular. My return to the ER marked the start of the process of the real problem which was a UTI. I was run through the cat scan that revealed what was really going on. I was brought some starter pills to swallow with some ice water and I was kept for a little while. I made use of my time by having the nurse bring in large amounts of ice water. Had I known what was really going on, I told her I would've brought my water jug from home. I asked her if they had one I could borrow with some ice water, but they didn't. What she was able to bring me is multiple covered Styrofoam cups of ice water. I can't say enough that the first part of my healing started with a ton of loose bowel movements, and good thing I was right near a bathroom. I wasn't going to sit on that gurney know more than I absolutely had to because the mattress was not that great and you could feel the metal pan below you. I knew I had to make use of my time until discharge, so I made use of that time by drinking lots of ice water while awaiting the return of my results and a report from the doctor. That's when I learned I had a UTI. This is only one example of why it's so vital to drink enough water, because you can also get kidney infections. Give me infections are actually very treatable within a matter of hours or less if you know how to spot them and catch them early. Knowing your body well enough to know how to spot and early kidney infection or even a UTI early on is key to getting rid of it very quickly. I can honestly say from experience that ice water really helped me tremendously. What do you want to do is find out whether or not you have any swelling where the infection is. If so, what I would do in your shoes is to shrink it internally by drinking lots of ice water. You want to start on an empty stomach if possible, because your body will be more focused on using that water to clean itself out and help you eliminate toxins. The less your body has to do, the more focused it's going to be in fighting any infections.
I will give you a sample warning about pneumonia:
From what I've heard about it, it's deadly if not addressed in a timely manner. That's because the pneumonia involves your respiratory system which is very close to your heart and lungs, and your longs are part of your respiratory system where is your heart and helps keep you alive. If this infection ever spreads through your body, it can actually kill you at some point. This is why you really need to get down to business and gain the upper hand and win this fight. I don't know whether or not you're currently under a doctor's care, but if not, you really should be because with a doctor's help, you can win the fight against pneumonia. You don't have to suffer needlessly because pneumonia can kill you if you're not careful. Your body has an internal "clock" that will tell you when you don't have much time have left, that's how I knew I had to turn for medical help for whooping cough. When you reach this point, you really don't have much time left and you really don't have no choice but to do or die. When you get to the point of nearing death like I did, you will get desperate enough to take serious drastic measures to gain the upper hand of the illness.
Too many people tend to not take an illness seriously until it's too late. Don't become a statistic. Fight now and gain the upper hand while you still can because you may not have tomorrow if you let this go on.