B757-200 FLT CREW DECLARES AN EMERGENCY AND RETURNS TO DEPARTURE AIRPORT FOR OVERWEIGHT LNDG AFTER FLT ATTENDANTS REPORT FUMES IN THE CABIN.

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SHORTLY AFTER DEP DURING INITIAL CLB; FLT ATTENDANT 'A' CALLED AND MENTIONED SENSING FUMES IN THE CABIN. SHE FELT HER CHEST WAS FEELING HVY AND WAS HAVING DIFFICULTY BREATHING. WE SENSED A SMELL IN THE COCKPIT AS WELL BUT NOT SO DIFFERENT FROM OTHER TKOFS WHERE THE AIR CONDITIONING SYS INGESTS SOME EXHAUST FUMES AND IT EVENTUALLY CLEARS. I RELATED THIS TO FLT ATTENDANT. FLT ATTENDANT ADVISED THAT THE PAX DIDN'T SEEM TO BE AFFECTED SO MUCH; HOWEVER; FLT ATTENDANT 'C' WAS ALSO FEELING A BIT LIGHTHEADED. WE LEVELED AT AN INTERMEDIATE ALT AND THE FLT ATTENDANT 'A' NOTICED THAT IT WAS DISSIPATING. WE NOTICED (AS WE EXPECTED) THE SAME AND CONTINUED ASKING TO BE KEPT ADVISED. I CALLED THE AFT CABIN ASKING IF THEY NOTICED THE FUMES. THEY SAID YES; HOWEVER; NOT SO STRONG. WE STARTED TO CLB AGAIN; AFTER WHICH WE RECEIVED ANOTHER CALL ADVISING THAT FLT ATTENDANT 'A' NEEDED TO USE SUPPLEMENTAL OXYGEN. WE ELECTED TO LAND AT DEP ARPT. AN EMER WAS DECLARED; THE LNDG WAS NORMAL EXCEPT FOR BEING OVERWT. FLT ATTENDANT 'A' WAS TREATED BY PARAMEDICS AT THE GATE. LATER SHE RPTED FEELING FINE. UPON ARR; THE FLT ATTENDANTS IN THE AFT PART OF MAIN CABIN SAID THEY NOTICED THE SMELL TO BE STRONGER DURING DSCNT AND LNDG. THE R HYD SYS HAD BEEN WRITTEN UP WITH AN OVERHEAT INDICATION PROB. WE WITNESSED THE REQUIRED PROC FOR THE DEFERRAL AND SAW THAT IT PASSED THE PROC. AFTER GATE ARR; MAINT DID SOME INSPECTING AND FOUND THE L WAS VERY HOT; NOT THE CTR OR R. THIS IS JUST MY GUESS; I SUSPECT THE FUMES MAY HAVE BEEN SKYDROL. PERHAPS THE FUMES WERE MORE NOTICEABLE TO THE MID CABIN FLT ATTENDANTS BECAUSE THEY ARE SITTING CLOSER TO THE SYS.