It really depends on what kind of illness your bird has.
Parasites and MitesSigns and syntoms:1. too much itching and scratching that doesn't look like regular preening
2. Tiny black dots on dropped feathers (Check. Mites can't harm humans so have no worries if there really is mites, the kind budgies and other cagebirds get only live in feathers.)
3. Tiredness and lack of activity
Solution: a spray of Mite Medicene should solve it, just don't spray too much, and don't get any in the bird's eyes as it can make them blind if it does. Mite Spray can be purchased in a good pet store.
Notes: Beaware of Red Mite. These are more serious mites, and if your bird has them you need to get rid of them before they multiply. They are serious because they suck blood.
Physical InjurySigns and Syntoms:(Do you really need them? Can't you tell if there is blood in areas of the body, turning the outer feathers red? It's obvious and easy to spot, yet serious. If something like this happens, you can't just do nothing as it will badly sting for your pet bird. If it isn't blood and it's a bruise, however, it can be harder to see, so you must watch the bird's behaviour and check under feathers if it looks upset and or hurting)
Solution: Some people keep budgie first aid kits, and this is reccommended on websites explaining usual budgie care. But if you don't have one - which you probobly don't as they are not really sold in stores or given with budgies - you may want to call a vet or try find more info. Be quick as it could get worse by second. A vet or breeder will know what to do. If it's a blood feather (see a budgie care site if you don't know what this is and you want to know) then it's better off being removed. Just don't yank it off without knowing what you are doing. If the bird had a collision with a window or wall, you will first want to know what you're dealing with and where the injury is.
Illnesses, Disease, Infection, VirusSigns and Syntoms:1. Huddling up in corners, but also a sign of mites
2. Not eating
3. Not drinking
4. Not moving
5. Looking overly tired. Also a sign of mites
Solution: Anything your budgie can eat to solve it. It might be a food they eat or a medicene / spray / ect they need. I'd ask a breeder or vet what kind of medicenes you need
Notes: Illness / disease / virus / infection is hard to see in budgies and other cagebirds as it is their natural instinct to hide it in case preditors notice it and they are targeted as prey. It isn't easy too see in their behaviour for these reasons.
If what you are looking for isn't hereThink about:1. Looking for another question that answers the problem
2. Looking on the internet
3. Asking a veteran keeper, breeder, ect what they would do
4. Look it up in a handbook. When you got your budgie you should get a handbook to tell you how to care for it and what to do in these situations.
5. Look it up in a virtual handbook, found on websites about cagebirds like budgies
6. Do whatever you did if you saw this problem before
All round I think books would be the best way. Flick over to a section typically named Health, Disease, Illnesses, or Health Care.
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This question is a matter of opinion. Some people like English budgies better than regular budgies or other people like regular budgies better than English budgies.
Yes, budgies are parakeets.
Budgies are parakeets. They eat seed
Yes, they're called gay budgies, ey.
snakes eat budgies so you better watch out
Yes, budgies can certainly imitate whistling sounds.
when can baby budgies eat on their own
The collective noun is a chatter of budgies.
Yes, lots of people have pet budgies.
budgies can be different clolours like blue white and yellow
There are lots of budgies in the world, but nobody knows how many there are for sure
Budgies are as smart as a 3 or 5 year old person.