Belakang saya sakit sedikit hari ini.

In Malay, possession is usually shown as:

noun + possessor

So:

• belakang saya = my back
• rumah saya = my house
• kawan saya = my friend

This is different from English, where the possessor comes first.

Yes. Belakang has a broad meaning: back / rear / behind.

Its exact meaning depends on context. In this sentence, because it is followed by saya and then sakit, it clearly refers to the body part:

• belakang saya = my back
• sakit = hurts / is painful

So here it does not mean behind me. It means my back.

Malay often does not need a separate word like is in sentences like this.

The word sakit can mean:

• painful
• sick
• to hurt

So Belakang saya sakit naturally means My back hurts or My back is painful.

Malay often lets a word like sakit act as the main predicate without adding a verb like is.

Sedikit means a little or slightly.

So sakit sedikit means:

• hurts a little
• is a little painful
• slightly painful

It softens the statement. Without sedikit, Belakang saya sakit hari ini sounds stronger and more direct: My back hurts today.

Yes, hari ini means today, and Malay time expressions are quite flexible.

All of these are possible:

• Belakang saya sakit sedikit hari ini.
• Hari ini, belakang saya sakit sedikit.

Putting hari ini at the end is very natural and common. It works a lot like English today at the end of a sentence.

Yes, it is understandable and correct.

In everyday speech, though, many speakers would more often say:

• Belakang saya sakit sikit hari ini.

The difference is:

• sedikit = more standard / formal
• sikit = common spoken form

So your sentence is fine, but in casual conversation sikit is very common.

Not always. Belakang is a general word for back.

If you want to be more specific:

• pinggang often refers to the waist / lower back area
• bahagian belakang = the back part

So:

• Belakang saya sakit = My back hurts.
• Pinggang saya sakit = My lower back / waist area hurts.

If you mean the whole back generally, belakang is fine.

Saya is the neutral, polite, and safe choice in most situations.

• saya = polite / standard I, me, my
• aku = more informal, casual, intimate, or sometimes rough depending on context

So belakang saya is the normal choice for standard Malay. A sentence with aku would sound more casual and personal.

Yes, belakangku is possible, because -ku can mean my.

So:

• belakang saya = my back
• belakangku = my back

But there is a difference in style:

• belakang saya = neutral, standard, everyday
• belakangku = more literary, expressive, or intimate

For most learners, belakang saya is the safer and more useful form to start with.

Yes, that is also possible, but it shifts the focus a little.

• Belakang saya sakit sedikit hari ini. = My back hurts a little today.
• Saya sakit belakang hari ini. = I have back pain / I’m suffering from back pain today.

The first sentence focuses on the back as the thing that hurts.
The second focuses more on you as the person experiencing back pain.

Both are understandable, but the original sentence is a very direct way to say that your back hurts.