لو راسك بتوجعك، لازم تشتري دوا من الصيدلية.

Yes. لو is the everyday Egyptian Arabic word for if. It is the most common way to introduce a condition in speech.

In Modern Standard Arabic, you may also see إذا or إن, but in everyday Egyptian لو is very normal.

Because Arabic attaches possessive pronouns directly to the noun.

• راس = head
• -ك = your

So راسك literally means your-head, which is just how Arabic says your head.

Also, in colloquial Egyptian spelling, the hamza from Standard Arabic رأس is often omitted, so راس is a very common informal spelling.

Yes. That is a very natural Arabic way to talk about pain.

Instead of saying something like you have a headache, Egyptian often says:

• body part + hurt
  • object pronoun

So:

• راسي بتوجعني = my head hurts me
• راسك بتوجعك = your head hurts you

This sounds different from English, but it is a normal everyday pattern.

You can think of it like this:

• بـ = present/non-past marker in Egyptian
• تـ... = imperfect verb form
• وجع = hurt, ache
• -ك = you

So بتوجعك means it hurts you or it is hurting you.

Also, in Egyptian Arabic, the letter ج is usually pronounced like a hard g, so بتوجعك sounds roughly like betwagaʿak / betwagaʿik.

Because in everyday Egyptian, راس is often treated with feminine agreement in this kind of sentence, so the verb appears in the تـ form.

So راسك بتوجعك means your head hurts you.

This can confuse learners, because تـ can also mark you in other verb forms. But here the subject راسك makes it clear that the meaning is your head hurts, not you hurt.

لازم expresses necessity.

Depending on context, it can mean:

• must
• have to
• need to
• sometimes should

In this sentence, need to or should sounds natural in English, but لازم itself is a fairly strong word.

After لازم, Egyptian Arabic usually uses the bare imperfect verb, without the بـ present marker.

So:

• لازم تشتري = you need to buy

Using بتشتري here would not be the normal way to express need to buy.

Because Arabic normally uses a finite verb where English often uses an infinitive.

So the structure is closer to:

• لازم تشتري = literally something like it is necessary that you buy

That is why you see تشتري rather than a separate word meaning to buy.

دوا means medicine or medication in everyday Egyptian Arabic.

It is the colloquial form of Standard Arabic دواء. In spoken Egyptian, words are often simplified, and hamzas are often reduced or omitted in pronunciation and informal spelling.

So دوا is exactly the kind of word you expect in a natural Egyptian sentence.

Because the sentence means medicine in general or some medicine, not one specific medicine already known to both speakers.

So:

• تشتري دوا = buy medicine / buy some medicine

But:

• تشتري الدوا = buy the medicine

The version with ال would usually refer to a particular medicine already mentioned or understood from context.

Because من marks the source.

So دوا من الصيدلية means medicine from the pharmacy.

If you used في الصيدلية, that would mean in the pharmacy or at the pharmacy, which fits other situations, but من is the natural choice after buy here.

The ال article changes its pronunciation here because ص is a sun letter.

That means the l sound of ال assimilates, and the next consonant is doubled. So you hear something like:

• eṣ-ṣaydaliyya

In a simpler learner-friendly spelling, you may also see something like es-seydaleyya, but the first s is actually an emphatic ṣ sound because the word starts with ص.

Yes. The sentence works for both, but the -ك endings change in pronunciation.

In speech:

• to a man: راسك بتوجعك، لازم تشتري...
• to a woman: the same spelling is usually used, but the -ك is pronounced more like -ik

So the written form often stays the same, but the spoken pronunciation changes depending on whether you are addressing a man or a woman.